The engine covers mount to the engine differently. Pretty sure you can't swap them.
Look at the bolt holes. I believe the oil filler hole is also slightly different.
2010 BMW 335d "Ha! She wants the D."
2004 Volvo S80 2.5T
Once upon a time...
'03 VW GTI, '99 Audi A4 1.8TQ, '00 VW Jetta 1.85T, '09 BMW 335i xDrive, '04 BMW Z4 3.0i, '01 Audi TT 1.8T