W221 airconditioning compressor replacement with newer type unit

[Grob115]

Hi

I am wondering if its possible to fit the new late 2008 type compressor onto a 2007 model S500.
My local guy says yes but I know the clutch is different. I also remember when you carry out the telematic update you have to tick which type of compressor is installed.
Anyone have this issue?

 

[Craiglxviii]

I know that it's a 4-5 hour job to do on the 220 and 215, regardless of the part; I wonder if the 221 is much different?