Relax, dude. I could've sworn you said something regarding Sega Genesis not being on the Virtual Console, maybe it was something about Sega not wanting it to happen, but that was long ago and it's possible I could've mixed you up with someone else. Sorry about the mix-up, and sorry for sounding so harsh if I did. But please chill out a little.
From what it sounds like, you're saying that they had the same processor, but the sound chip, amount of RAM, and how developers utilized the system were different.
Humans have something like 80% of the same DNA as a fruitfly and 60% of the same DNA as a banana. I remember seeing that in a science museum. Even if I'm remembering wrong, I'm sure it was over half, or a sizeable fraction, but my point is even if the processor is the same, but the only thing the same, that doesn't make them alike. There are a number of games where it's kind of hard to mistake one for the other. No one confuses a person with a fly or a piece of fruit.
But we're going off-track here. Regardless of the processor and emulation methods involved, I think we agree that the Wii should be more than capable of handling Neo-Geo games and also should have them there on the VC. (No need to start getting into technical knowledge showdowns about the Genesis!)