Theres been some discussion once the KH ISIS cranks and hub and the Koxx hub and cranks.
Because they are ISIS, all ISIS cranks would fit onto them, that being said, people have took other ISIS cranks and put them onto the KH ISIS hub. They fit perfectly, just like they should, because they are both ISIS.
Then, people have tried doing the same with the Koxx ISIS hub, but no other cranks fit them except for their own Koxx Isis cranks. Then some other people have measured and found out, that the Koxx crank and hubs are of a different measurement of all other ISIS components out there.
I think all of this is discussed in the later pages of this KH thread.