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Since I had both a campag and shimano I was able to swap them around but from memory I think the internal section profile of the freehub was different, so it required a slightly different axle, I think that was the only difference in the end - I think all other bits you could use either. But I would certainly check with manufacturers documents and don’t quote me it was a while ago!
About to go through the same process on a Campagnolo wheelset that comes with a Shimano Freehub. What is the bit that I need to buy to make this a Campagnolo wheel?