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That's also what I'd heard originally for the 11sp, that Shimano 11sp cassettes worked ok with Campag 11sp set-up, but from what I can filter from all the anecdotal info online, Campag cassettes don't have equal spacing across the 11 sprockets, whereas Shimano/SRM do ? Hence some say the mix works fine, the fraction of a mm difference isn't noticeable, and others that you can notice the difference and it's noticeabley not as smooth as Campag to Campag...?
There was some funny business with 10s, IIRC... two versions, one with non-uniform spacing, was that it?
The arrival of 11s finally put a stop to worrying about anything beyond having the right number of cogs, didn't it? After all these years you can just throw in a Shimano wheel no problems.