Upgrading a campy 9s (1998) hub with a modern (oversized) 9/10 freehub body

[Lisa]

I have a 1998 chorus hub and would like to repalce the freehub body. Is it possible to upgrade a 1998 9s chorus hub with a modern (oversized) 9/10shub body? If so, what all is needed? axel, cones...

Thanks for any advice

[Gothard]

The small 9sp hubs have a steel axle, small diameter.
The large hubs have an OS alloy axle. No compatibility at all.

That said the older small hubs that are 10 compatible are sought after.