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->''"It's funny. Every crook I meet wants to tell me how much I'm just like them."''
-->-- '''Edward Elric''' to '''Psiren''', ''Anime/FullmetalAlchemist''

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Two characters or outfits who seem radically different turn out to have more in common than they would like to believe, and this doesn't go unnoticed in the story.

This is usually the resolution of an EnemyMine or LockedInAFreezer plot: two enemies learn that there is [[SympatheticPOV more that unites them]] than divides them. The punch line to about 50% of plots in an OddCouple or OddFriendship series.

On the darker side, this can lead to the realization that our hero is really just a hair's breadth away from villainy. In these cases, it's almost always the ''villain'' who is the first to notice: our hero has him cornered and even seems to ''[[EvilTastesGood relish]]'' the prospect of finally ridding himself of his nemesis, and the villain deftly points out, "We're not so different after all." The hero realizes [[IfYouKillHimYouWillBeJustLikeHim how close he is to crossing the line, and spares the villain]] (though every once in a great while, he'll decide that it's worth crossing the line, off the villain anyway, and then have several episodes of moral anguish over the darkness in his soul: see ShootTheDog). Especially common when the villain is the hero's EvilCounterpart.

Also a bad thing when the bad guy points it out after the hero has bested him through questionable tactics. Often followed by the hero's hysterical protests along the lines of, "I'm not like you! I'll never be like you!" Occasionally followed by the hero's observation that they are different, because of some other aspect that the opponent overlooked or intentionally ignored. However, the hero sometimes has some snappier comeback, like "You noticed?" or "That's why I can beat you," and worries about the differences later--or a comment that the dog that protects the flock is a very close relative of the wolf that ravages it. Then again, a simple "{{shut up|Hannibal}}" can work wonders. Another common rebuttal is for the hero to acknowledge that they share some similarities, but are sufficiently different where it ''counts''; not all similarities are equal.

TheHorseshoeEffect is when two people claim to be ideologically opposed to one another, but nevertheless have many beliefs in common.

When the villain who believes this also believes that the hero denies it because he is a SlaveToPR, he often sets up WhatYouAreInTheDark to get the hero to act like it. The failure rate for this approach is… high.

Heroes sometimes use this to confront a WellIntentionedExtremist or a KnightTemplar as [[WhatTheHellHero to call them out.]] Being compared to their enemy will often trigger their BerserkButton. Contrasts with NotSoSimilar and YouKeepTellingYourselfThat. Also compare SharedFamilyQuirks, which is when two seemingly different family members have something in common behavior wise. HitlerAteSugar is when this trope is stretched to the point of becoming a fallacy.

* NotSoDifferent/AnimatedFilms
* NotSoDifferent/AnimeAndManga
* NotSoDifferent/ComicBooks
* NotSoDifferent/FanWorks
* NotSoDifferent/{{Film}}
* NotSoDifferent/{{Literature}}
* NotSoDifferent/LiveActionTV
* NotSoDifferent/{{Music}}
* NotSoDifferent/TabletopGames
* NotSoDifferent/{{Theater}}
* NotSoDifferent/{{Toys}}
* NotSoDifferent/VideoGames
* NotSoDifferent/VisualNovels
* NotSoDifferent/WebComics
* NotSoDifferent/WebOriginal
* NotSoDifferent/WesternAnimation
* NotSoDifferent/RealLife

[[folder:Professional Wrestling]]
* Wrestling/JimmyJacobs has repeatedly tried to pull this on [[Wrestling/DeanAmbrose Jon Moxley]]. This once lead to the two being chained together in Insanity Pro Wrestling, for [[GimmickMatches a dog collar match]] after Jacobs cost Moxley the promotion's top championship belt and said that when he looked at Moxley he stared at himself in a mirror.
* Wrestling/{{Raven}}, after deciding that he was insane while in Wrestling/{{TNA}} and could not be cured, decided that Abyss was the same way and to make Abyss admit it.
* Wrestling/BrayWyatt said this to Wrestling/DeanAmbrose on the 10/27/14 episode of Wrestling/WWERaw. Wyatt said that looking at Ambrose was like seeing "a deranged reflection" of himself.
* Kevin Kelly frequently does this, where appropriate, when addressing feuding members of the Wrestling/{{ROH}} roster. For example, when Kenny King returned from TNA and went on a rant about why he couldn't stand ACH, Kevin asked if The All Night Express, King's TagTeam, weren't a pair of [=ACH=]s a few years ago.

* ''How Green Was My Cactus'': "Boris and Gorby go to UsefulNotes/McDonalds" is about UsefulNotes/MikhailGorbachev and BorisYeltsin opening up to western capitalism. Their experience with fast food gives them the following revelation:
--> "Is not so different! ''We'' stand for ages in queue to get served by pimply little people who work like hell for rotten veggies, and the food is terrible!"