Lampshaded in the blog-novel Flyover City!, when the protagonist tells the big bad “…you know, we really aren't so different, you and I. Us, I mean.” - which compels the villain to list off all the ways they are emphatically not alike.
In the Whateley Universe story "It's Good to be the Don", Don Sebastiano gives this spiel to part of Team Kimba as he tries to lure them into his group. It nearly works.
In "Ayla and the Birthday Brawl", Phase successfully tries this routine on Jobe. But Phase is one of the main heroes, and Jobe is the son of a supervillain.
"You are wondering why I have given you this task. Why I trust you. My reasoning is not so difficult to understand, after all, we are similar. Your father is pushing you into a life you don't want, and my father... well... Let's just say I sympathize."
In Greek Ninja Sasha and Daichi are like this. After their fight, she tells him:
'You have no purpose. Life is mundane to you. Each day is just another day you have to get through with. You are surrounded by nothing that’s really important to you. So why should you fight to protect it? I understand cause that’s the way I was.'
Dragon Age: Redemption gives us the lead character Tallis and her first ally, Cairn, who serve two opposing masters. Over the story, it is revealed that the two of them actually have very similar moral theologies. Both of them have defied their superiors and went renegade to deliver their own brand of justice. Tallis killed an Orlesian when she discovered he raped slave girls, and Cairn attempted to kill the Saarebas when they slaughtered his family.
On several occasions, Taylor finds herself imitating the strategies of her antagonists, much to her discomfiture.
The supervillain Mannequin implies this while trying to recruit Armsmaster.
When Taylor is talking to Shadow Stalker in the immediate aftermath of Scion beginning his rampage, Shadow Stalker characterizes Taylor as being a copy of herself.
We're Alive: Riley's arc in Season 4 has her chasing down Scratch in a Roaring Rampage of Revenge after Scratch killed Angel. This parallels Scratch's own obsession for revenge against Pegs, who killed Scratch's brother, Latch. As Riley begins using more and more extreme tactics to try and catch Scratch, other begin to comment on the similarities between the two including Tardust and Scratch herself.
This article examines the special effects from the Star Wars franchise, focusing on the backlash against the use of CGI throughout the Prequel Trilogy, noting that the methods used are ultimately not that different from those of the Original Trilogy.
Common in Death Battle, as several matches are between two characters who share similar powers, appearances and/or personality traits.
Actually Invoked as an argument in "Batman vs. Spiderman", as Batman's fighting style is very similar to that of the Green Goblin, a gadget-wielding Badass Normal who serves as one of Spiderman's top foes. Spiderman would have some innate degree of familiarity with Batman's fighting style and hence a significant advantage.
Also Invoked in "Thor vs. Mortal Kombat!Raiden", as Raiden's strategic fighting style is noted as very similar to Loki's cunning and cleverness. And hence, nothing really new to Thor. Sure enough, between this familiarity and outclassing Raiden in raw power, Thor takes the win.
RWBY: Blake's obsession with trying to stop Roman in Volume 2 leads her to research relentlessly to the point that she's losing sleep, isn't eating, can't focus/stay awake in class and will hardly speak to anyone. Yang relates to her a story of her searching for her mother when she was younger, and almost got killed by some monsters as a result were it not for her uncle saving her and Ruby. She then tells Blake that she hasn't stopped looking for her mother, but doesn't put that above living her life and spending time with her friends and family like the latter had been doing the last few days. Blake relents and decides to take it a little slower, and goes to the dance the next day.
Jim Sterling and Digital Homicide once engaged in an informal debate. Throughout the debate, DH tried to pull this trope on Jim, who directly called it out, noting it as his favourite trope, and dismissed it.
The three interstellar superpowers in Ad Astra Per Aspera, much like their terrestrial counterparts from Nineteen Eighty Four, have radically different ideologies but only in theory. The Coalition fights to "preserve Christian civilization and liberty", the Conseil fights to "liberate the proletariat from their bourgeoisie oppressors", and the Technocracy fights to... well, preserve its own power. However, in practice, all three are just as expansionist and dictatorial as each other, all three wage Forever War to keep their people down, and all three pump out massive amounts of brain-rotting propaganda. Practically everyone also agrees that democracy is a weak and obsolete form of government.