Should we care about disc revisions for games where the box is not changed? For example, I can confirm that there are multiple different CD versions released in the same Warcraft II: Battle.net Edition box.
http://vgcollect.com/item/8447From what I can tell, it breaks down like this:
2.0 = S0260270
2.01 = S7120210
2.01A = S7120211
But there is no change to the barcode or box itself.
Even so, there are versions the jewel case has a barcode and Product Key, barcode no key, no barcode no key, no barcode + key. Not sure how these were distributed.