new a6er here

Are the brakes the same on the 01' 2.7t, 4.2 01' (hp calipers)

MP4.2+6.0

Same diameter rotors and HP2s, but offsets likely less on the 2.7--4.2 offsets always consistent, but 2.7's apparently have both the typical 2.7 shallower offset, but also the bigger 4.2 one.. 2.7 is generally the same as the S4 in front; same in rear as S4 except no slotted rotors stock.