Here's how this works...
If MAMEDEV knows the difference (based on revision date/version physically marked on the ROMs or contained within the data or other information) then it's included in the set description.
Sometimes some MAMEDEV (like stephh) has complete understanding of the processors used by the games and can make a judgement call as to which set came first based on looking at the code/data, and then this will also often be reflected in the description.
If NEITHER are possible - then simply "set 1", "set 2", are put in the description, with no value judgment.
Sometimes users come back with suggestions about the ordering and that will sometimes be reflected in the source code comments. Such as "I just dumped the Pac-Man 2.0 upgrade kit I own, and the ROMs match set 2, so set 2 should really be called 'Pac-Man 2.0'"
(There, I don't think I missed anything...)
- Stiletto
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