Retrofitting XC60 Heated/Ventilated/Massage Seats Into an XC40?

[Sodertalje]

Heating and ventilation both are controlled by the same LIN (SLAVE) module connected to the CCM (climate control). It has nothing to do with CEM. 
Massage seats are controlled by the seat comfort module integrated inside the seat controller (CAN) module. It has nothing to do with CEM either. 

In both cases CEM holds and sends the configuration settings to both CCM and Seat Controller through CAN bus message.  
If the XC60 seats fits to XC40, I do not know. You'll need to measure them. If it fits, you will need to do some wiring.

I know that they are being controlled by LIN, but the CEM add the ventilation option on the screen, how is it otherwise possible to start ventilation? Massage is controlled by a physical button on the seat.