Hey guys,

I just bought a 1998 Audi A4 2.8L Quattro (manual) with approximately 150,000 km. This is my first Audi and I haven't really tore into it yet to see what's going on under the hood and this is my first time I've signed up for a forum, I usually just searched through forums but I could not find this question. Anyways regardless on the condition of my A4 I was looking for a cheap parts car regardless. There's a 2000 Audi A6 2.8L (automatic) with 180,000 km. I understand the A6 is a bit larger.
Is it wider as well as longer or just longer than the A4?
Interior wise is most things compatible? (not concerned about trim and panels, more so electronics, seats, sound system)
Under the hood is most things similar?
And what about suspension, control arms, ball joints, etc?
Obviously transmission I know aren't compatible

Thanks and sorry if this has been similarly posted.

Luc