S8 D2 front and rear wheel bearings same?

[strummagnet]

Jumping in here. I am looking to replace front and rear bearings as noticed a low whining sound apparently emitting from the rear of the car which after 400ish miles has manifest into a not so low grumble sound (speed related) which is apparent as soon as you go over 20mph - which I can no longer discern whether it is the front or the rear.

Looking online the bearings for cars with 20" rims appear to be different front to back?

S8 Wheel bearings:

For the front: 4F0598625A - For cars with 20 inch rims

For the rear: 4D0407625D

You guys concur?