Two characters or groups initially appear to be quite similar, possibly so similar as to be practically interchangeable. As the work develops, however, it becomes clear that the similarity is only superficial. Their deeper characteristics, such as motives, morals, or methods, are quite dissimilar. They may fill roughly the same role in the story, but they are far from interchangeable. If another character comments on the similarities, one or both of those being compared may respond along the lines of "What? I'm nothing like him!" before listing the differences.
Common cases include Cloning Blues, Shadow Archetype and Legacy Character.
See also Our Monsters Are Different; and Divergent Character Evolution, if the subjects really were interchangeable at one point.
Cast Speciation is a subtrope that applies only when the characters are part of a small cast of characters. The inversion, when characters who appear to be very different turn out to be quite similar, is Not So Different.
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In general, if the ad isn't claiming the product in question isn't a more affordable version of the competition then they are using this trope, such as when Verizon Wireless, and AT&T, two American phone companies who used to have a friendly relationship, broke away from each other. They both quickly dedicated much of their budgets to letting everyone know why they should never be mistaken for the other.
Between the 1910s and 20s Coca Cola became well known in several countries and also became frequently imitated. The most humorous duplicates being Sola Cola and Coc Ola. Naturally, many commercials were put out explaining to the consumer why these knockoffs were inferior to the real thing.
Anime and Manga
Piccolo and Vegeta from Dragon Ball, two evil aliens who became friends with Goku. Piccolo initially saw Goku as an obstacle to World Domination, Vegeta just had an obsession with becoming the strongest and Goku's existence got in the way. Also, Piccolo's friendship was genuine, even if he hated to admit it.Vegeta didn't bury the hatchet until the entire universe was at stake. Piccolo at one point has to explain Vegeta's own problems to him.
The Transformers Armada Starscream takes offense when the Autobots try to compare his treachery to Sideways.
Blade felt he had a lot of similarities with The Punisher but had to question why Frank Castle pursued a seemingly impossible goal while Blade felt his own was much more reasonable(He even succeeded once already). In Frank's answer Blade(and the readers) start to understand just how different they really are.
In a meta sense, Marvel gave Blade to a popular Wolverine writer hoping he could duplicate that success. It was made clear that they weren't really that alike.
In the various DC-Marvel crossovers, although both universes have a planet Earth which is inhabited by a human species with broadly similar histories up to about the 1960s, it's been shown that they're fundamentally different down to even the background cosmic principles each is based on.
Multiple Man has the power to create body doubles of himself and they usually work together, as they always embody a part of his personality. Sometimes an isolated part of himself can end up behaving very differently from the whole however, many of his body doubles have caused trouble he really doesn't approve of.
Judge Dredd has the law enforcement collecting the genetic material of their best judges to ensure they can always create great judges to replace them. Though they often get exact genetic copies of outstanding judges, the clones rarely end up like their predecessors. Just because they have the same talent doesn't mean they want to apply it the same way.
This is why Blink ends up as leader of the Exiles, because she is the first on the multiverse crossing team to realize the "familiar faces" they encounter may be anything but.
At the beginning of Deadpool vs. Carnage, the former makes several comparisons between himself and the latter. He changes his mind after finding the remains of a family (which included two young children) that Carnage had taken hostage, terrorized, and butchered.
Deadpool: Carnage and me... not... not on the same wavelength... at all! Not like him. Would never do anything like that...
In Star Trek: Nemesis, Data has to explain why Captain Picard shouldn't expect his clone to be much like him. As a robot, he is just one of many of his line but he knows just because the rest have the potential to be just like him doesn't mean they are or even will be.
All Through The Night criminal Gloves Donahue describes just how wrong Nazi Franz Ebbing is when the latter thinks they have enough in common to work together.
In Inception, one of Dom's nightmares takes the form of his deceased wife Mal in order to guilt trip over his past mistakes. It works at first but Dom overcomes by realizing and pointing just how much its imitation failed to compare to the real thing.
Titan/Tighten: You should stop comparing me to Metro Man!
One book in The Chronicles of Narnia introduces us to Tash, who one figure stubbornly insists is another culture's take on Aslan, no matter how many times the fact it isn't is explained to him.
Harry Potter starts to find the similarities between him and Voldemort fairly early on; both are dark-haired, relatively popular guys who started out their years without parents and found Hogwarts to be their home. However, each circumstance is marred with differences; Voldemort was conceived through a loveless union. His mother, while sympathetic, still gave her son to an orphanage. Voldemort instigates much of the antagonism against people in his youth. Harry on the other hand, had parents who loved each other and mother was brave enough to sacrifice herself against Voldemort.
The Jungle has a passage dedicated to how some view political parties as autonomous machines full of same thinking people and how naive the believe is. It is demonstrated in a heated debate between a mildly anarchist man who views all establishments as oppressive and wasteful, saying organized religion is the wort offender against a fiercely religious man who believes socialism owes its very existence to the teachings of Jesus Christ, who aimed to disrupt the wealthy and raise up the oppressed, so therefore Socialists should be using The Bible to promote themselves.
In Going Postal semi-reformed Con Man protagonist Moist von Lipwig worries that he is no different from his vile enemy, Reacher Gilt. In an epilogue that Moist doesn't get to see, we see that Gilt rejected the offer of reform from the Patrician that Moist accepted.
Live Action TV
Teal'C and Ronon Dex filled the same role on two different Stargate shows, the alien ally who had a long, personal history with the enemy and beat people up. A character who was on both shows noticed this and decided they'd work well together. When they met she immediately began to think otherwise.
When Angelus from Angel gets "I'm not like you" shouted at him by Faith he admits it to be true but then adds "You will be."
In the 2000s Battlestar Galactica, all of the Cylons got backup bodies they could jump into when their current one broke down and a few went as far as to use multiple bodies at once. Some Like Boomer unexpectedly developed their own, very different personalities which created some friction between them.
Baron von Richthoven of Black Adder believed that since his and Lord Flashear's careers neatly parallel each other that their values would as well. Since you're on this page, you know he was sadly mistaken.
The regeneration gimmick of Doctor Who is mainly used to keep the show going when the actor playing the doctor is no longer available but different actors leaving a different impression on the character was inevitable. Rather than try to hide it, the show embraces it.
The kings of Assyria told the people of Judah not to be fooled when Hezekiah said God could save them because they had destroyed the gods of everyone else they conquered. Hezekiah told them that they only did that because those gods were only idols made by human hands.
To the uniformed, CM Punk and Jeff Hardy's could have been thought to be much alike. Tattooed, skinny (by wrestling standards) weirdos who both wrestled in ECW. Before their rivalry became serious (before Punk cashed Money in the Bank on Hardy) the two had a civil argument on Raw which ended in Jeff in saying "You know Punk, we're pretty different." As their rivalry became more bitter, these differences became more and more apparent to everyone.
Another relating to CM Punk are his protests against WWE management. R-Truth, Christian and The Miz all seemed to have similar issues but as it turned out the first two's bigger issue was with the fans and the fact the general managers were ruling on things they wanted, Punk was upset about management not doing enough for fans. Meanwhile Miz was complaining about being overlooked and declaring himself awesome, similar to CM Punk claiming to be under appreciated and the best wrestler in the world. The difference here was that Miz had always been pandered to until his recent losing streak, CM Punk did not have nearly the amount of exposure even when he became a triple crown champion.
When Alberto Del Rio debuted everyone assumed he was an expy of JBL. Christian called him Juan Bradshaw Layfield. They both came to the ring in cars, both were kind of racist and they both hated Rey Mysterio. The first clear difference was that Alberto was a Mexican aristocrat to JBL's "self made man" stock broker. Then we learned that while JBL had a signature bull horn car Del Rio had a different one every week but what really put them apart was that JBL was much more of a dirty coward than Del Rio, who by contrast is more willing to get his own hands dirty as he believes he is destined to win. Their wrestling styles are very different and Del Rio's now known for his Hammy Herald. Nobody's calling him an expy anymore.
In Fire Emblem: Path of Radiance the two hateful jerks you employ sort of stick out for bringing down their more optimistic teammates but at least when they're on a mission together they'll finally have someone agreeable to talk to right? Nope, one of them likes the company but not the job, the other loves the job but barely tolerates who he works with.
In order to get Link's trust in The Legend of Zelda: Ocarina of Time Nabooru states "she's completely different from Ganondorf" even though they are both thieves and she's technically his subject.
X's copy in Megaman Zero claims to be a perfect copy. Zero retorts says the copy's strength and wisdom are both lacking in response. Whether or not the player takes his word for it, they can compare the two X's personalities for themselves and in that area they definitely are not alike.
Saber of Fate/stay night has a moment of this in the first route with regards to Shirou, in whom she had seen similarities to herself. When Shirou is offered the chance to rewrite history to prevent the disaster that destroyed his old life Saber assumes he will accept because that's what she wanted. Him rejecting the offer leaves her stunned and somewhat humbled by his resolve.
Wolverine: Maybe you ain't so bad after all, Blake. In fact, you kinda remind me of myself at your age. Except, y'know, I'm a mutant. And I've got ethics. And I'm not a psychopath... (or a rapist...) You know what, maybe you remind me of someone else...