Cards with major text changes and no errata in Unlimited?

sturdy_steelix

I was just curious, can cards that have major text changes, but no official errata, be used in Unlimited events? If so, how are they played? Stuff like Team Rocket Rainbow Energy, Base Set Pokemon Center and Bill.

I noticed that Base Set Computer Search is in the legal reprint list for Expanded, but it says for Unlimited only and to play as the Ace Spec. No non Ace Spec versions of Master Ball are in the document though.

And is Base Set Professor Oak a Supporter now due to the printing in TCG Classic, or does that set not count since it's not tournament legal?