the parent set is the original release with b12 stickers
the clones are a later release with b23 stickers
as all have proper labels it's not a proto, all Taito protos we've seen have the checksums marked on the ROMs instead.
my best guess is the parent was for the fancy cabinet, so gave you a shorter game time (rather than charging the player more to play on the expensive cabinet) and the clones were for a regular Jamma setup. The descriptions we have also agree with that.
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