I see difference in the 2 totally different pics of the 2 different cars. As for the skirts items, there are identical:
M5
http://www.realoem.com/bmw/enUS/show...diagId=51_8301
M Tech for 5-series
http://www.realoem.com/bmw/enUS/show...diagId=51_8301
The same way you can check the part nrs for rear bumpers and see they are the same. However the front bumpers and lips are different since M5 body is wider on the front.