Offically the mounting area of the casstte is the same. But some hub designs dont play so well with it. I know that Tune hubs have/had possible issues with the driveside flange. I have a wafer thin spacer between my cassette and my Tune Mag180. I've experimented with various set-ups, and this gives the best shifting to the big and little sprockets.
IIRC, my set-up is pretty worse case, due to the size and positioning of the driveside flange (also why I choose this hub). So you should be able to make any 10spd campagnolo hub work with 11spd cassette. Just maybe not OTP.
hope hubs no worky with 11 spd too...