First, thanks for the support
I am almost sure there is no versions for Genesis roms... but not 100%.
I think they are only cartidge chip dumps... well, there are modified ones to add some extra features, like unlimited lifes, etc.
But in this case there was a lot on unrecognised roms, and was no modified... and all work in different emulators and versions.
So I think Romcenter is wrong to say those roms was invalid... Maybe included dat file is the problem?
I tried downloading last no-intro .dat file, but romcenter uses mame dll with this dat...
How is the right text i must add to the dat file to force the use of sega dll?