You are sure the bearings are the same size? I don't know much about Campy but I know they use odd size bearings in some of their hubs. The change you're seeing came from somewhere.
You will have to shorten this axle but only $16.55. I used one of their front axles and no problems.

https://www.niagaracycle.com/categor...0x141x26tpi-qr
Wheels Manufacturing QR Rear Axle, 10mm x 26tpi x 141mm