Hmm, I personally don't think there's really a difference between them. The problem is the only compatibility difference between TF cards is that Castlevania PoR randomly freezes with some cards more frequently then it does with others.
So if someone plays the game for 5 minutes and it does not freeze then this person just updates the wiki: works fine.
If someone else knows how to improve the chance of freezing (teleporting, clicking the start button a few hundred times, something like that) and it freezes it updates the wiki: freezes with Castlevania PoR.
I think you can think of the R4 compatibility list being more reliable...