Take any Campa 102mm axle, if you have the cups that fit the standard of your frame's BB shell then it will fit.
For example, imagine you have a BSC standard BB axle and frame but the bearings are shot. You have a new one lying about that's conform to the ITA standard.
By simply swapping the cups around you now have a perfectly fine BSC BB again.
And vice versa form BSC to ITA.
Just be careful not to damage the bearings of the new BB as that's very easily done.
P.S Note also that the bearings can be replaced. Regardless of what Campa says....