10 minutes between your first and second post, give the thread a chance for people to reply. I personally don't know 100%, but if the disk sizes are both the same and solid, then the answer is yes, I believe the rear calipers of A3/A4/Golf/Passat etc for solid rear disks are all the same, but I stand to be corrected.
Thanks for reply.
Can anyone confirm for definit?
so do i just measure disk? or caliper?