dWARf!/Fleshmaster calls this between himself and Empowered, but she proves him wrong. Also, Sistah Spooky claims this to be true about her then-partner Mindf??k and Mindf??k's brother. (She just wanted to hurt Mindf??k.) What's really sad is that Sistah is right. Mindf??k had to psychically lobotomize herself in order to remove her less savory personality traits.
In volume seven, Oyuki tells Ninjette just how much like her father she is:
Ninjette: If you think that I am voluntarily walking into a scenario likely to result in my death and/or dismemberment without first getting good and solidly buzzed...you are sadly f**king mistaken. Oyuki: By sheerest f**king coincidence, this humble genin has often heard a remarkably f**king similar sentiment voiced before battle...by Kaburagi-san's own f**king father, interestingly enough.
Firefly: The Sting: Saffron claims that she and Inara are not so different as she tries to persuade her to join her heist.
Saffron: [I'm] what you would've been, if something had gone wrong. If you'd failed out of companion training. What you could be, if you let go of your pathetic hopes and dreams and boring rules. A free agent. I'm an object lesson in what you fear the most... and what you secretly wish for.
The Incredibles comic has this when Mirage and Elastigirl have to work together on a mission, Mirage bringing up the point that Helen ended up having to lie to her family about a new adventure as well as having been the ex-girlfriend of the supervillain they're going after.
Judge Dredd: Judge Dredd's Evil Counterpart Judge Death has tried this approach towards Dredd several times, noting that they're both zealous enforcers of the law, and even offered Dredd to be his new host on one occasion. Dredd counters that despite their mutual dedication to their principles, only Death enjoys killing for its own sake.
In Tempest's Tale, while helping Glitter Drops escort the lost Ursa Minor cub back home, Tempest realizes it's a lot like her: lost, alone, and lashing out in anger and fear instead of malice. Being able to sympathize with the same creature that had attacked her during her childhood allows Tempest to finally begin healing emotionally from her trauma.
In My Little Pony Micro Series Issue #1 Twilight says that she can sympathies with Jade Singer having to live with extremely high expectations, since being the princess' personal students puts similarly high expectations on her.
Scott Pilgrim: Scott makes the realization that he's as much of an asshole as his greatest enemy, Gideon Graves. The only difference is that Scott wants to change and be a better person. This realization causes him to level up and gain a sword called The Power of Understanding which he uses to defeat Gideon.
Scourge often brings this up to convince Sonic to be 'evil' like him. As he puts it, "All it takes is one bad day, and you'd be just like me." Throughout the series they compare themselves to one another (in one issue, Sonic says something along the lines of "My evil 'twin' conquered a planet on his own. What do you think will happen if I let loose?")
Promptly after the aforementioned Scourge quote, Sonic catches him off-guard with a counterattack, and while he's on his back, proceeds to throw the same thing right back at him, saying the real reason he hates Scourge is that if he only had a little kindness and decency, he'd be just like Sonic. Scourge is genuinely shaken by the thought.
The Transformers: Robots in Disguise: Prowl was fused with the Constructicons, and they all got a look at each others minds. He calls them some of the most vile Decepticons ever, they in turn really like him because of all of his devious ideas. Prowl isn't happy that they keep following him around and complimenting him.
Parodied in the Optimus Prime annual, in a scene from Frenzy and Rumble's movie, a badly-written in-universe Cliché Storm. Needlenose utters the stock phrase word for word with no further elaboration while fighting Slugslinger.
In Warlord of Mars, Talu, the supposedly benevolent ruler that replaced the tyrannical Salensus Oll, is revealed to be a power-hungry despot behind a conspiracy to destroy the Green People. Carter calls him out on this, but Talu disagrees stating that Oll was content with hiding from the rest of the planet, while he wants to fulfill their destiny of ruling over their world.
