Turtles in Time is balanced by Hyperstone Heist, I think. They're practically the same game and both really fun.
Yeah I was thinking about Super Metroid and Super Castlevania IV. I don't know that SM even has an equivalent on the Genesis, and certainly nothing as good. Super Castlevania IV is... a platformer? Action-adventure? I don't even know! In any case, Castlevania Bloodlines is better than Super Castlevania IV by just a tad, so they can probably cancel out. And we haven't mentioned them, but each system's Contra game probably does the same.