Already been done by Autoexpress:
Audi 3.0 BiTdi / BMW 535d
0-60/30-70mph 5.6/4.8 secs 5.5/4.7 secs
30-50mph in 3rd/4th 2.5/3.1 secs 2.0/2.6 secs
50-70mph in 5th/6th/7th 3.8/5.2/6.5 secs 3.6/4.5/5.7 secs
Meassured fuel consumption, econ (mpg/mpl)/range:
36.4/8.0/520 miles 35.7/7.9/550 miles
NOTE: 535d with RWD
Yes it's quite surprising that identical power produced near enough identical acceleration figures, despite one having to drive twice the number of wheels. I think in some other test this remain to be the case right up to 125mph.
Question is whether an awd 535d could achieve the same thing?