^ Definitely not, that's just a catalog product ID and certainly can not reflect all the complexity of its hardware. Here's an example of a MD cart pcb, you'll see for yourself it can be quite stuffed.http://img38.imageshack.us/img38/521/gamefactorypcb.jpg
as Vaas mentioned, your dump might be incomplete because of some unusual layout not supported by your retrode, I have seen that case, and you could easily have dumped just a portion of the rom(s) then. the retrode is making it look easy but there was a lot of engineering work behind that and Matthias (was it?) did not implement pcb layouts he never heard about.
I'm not sure I entirely get the label problem, can't you remove the sticker with vapor, then re-stick it with some paste?
Whatever, full preservation can sometimes mean you have to sacrifice something, I know about that having sacrificed a lot myself, you may want to keep that in mind before buying insanely expensive carts, though I know you think you're doing it for greater good, but perhaps you should let it to people with stronger resolve and stick to the more mainstream material.