Well I'll add my $.02 as an experienced Campy 10 user without a lot of knowledge about what goes on inside the shifter. I have 4 road bikes (almost done with a 5th - cross bike) with Campy Chorus and Record 10, another TT bike with Chorus 10. They are all mix and match parts, all obtained used from other bikes, and they all work great. The only routine shifting issue I get is on a couple of my bikes it takes two pushes on the paddle to get the FD on the big ring. I think the QS system was introduced for crisper FD shifting, that's whats going on my cross bike build now. I did put a QS FD on my time trial bike and it eliminated a problem with balky chainring shifting. Takeaway is I've never sweated the details on which gen is what and it's worked out fine.

At some point Campy 10 went from 6.2 to a 5.9 mm chain , which I believe is UD. IMO that is the most important to match up chain and cassette. I use OEM Record and Chorus 5.9 chains with KMC master links. Other chains like KMC and Wipperman work fine, but I think the Campy chains work better.