Well, the genderswaps don't really act like each other, their originals or their twin, so they've got a sort of niche.
Aside: I like the genderswaps' shoes.
She's kind of heavy, I might drop her!Me too, me too! Come on!Me next!Hey! Carry me too!Huh?! No! And you're in the way! Back off!Argh!! What the hell is with you two?I'm not gonna do it for either of you! Back off! You're getting me really mad!No, me!