S4 Rear Axles vs A4 Rear Axles

[Militant-Grunt]

Are they the same?

I found out that the rear wheel bearings are the same on both cars. Hence are the rear axles the same too?

[solowb5]

I believe they are beefier then the a4. If the bearings are the same I'd assume the splines are the same.

[ShawFM]

I do believe that the S4 has a 94mm inner CV joint, compared to a 90mm inner CV joint on the A4. I am not sure if the spline that fit into the CV joint are the same.