Hi I have a 2011 Vw crafter with air conditioning and the control panel has died, ive checked the following

fuses ok
fan motor works fine when powerd with 12v
resister changed
changed the switch panel with a used one from a breakers but was from a sprinter i just went by the pictures because its the same as original.

im at a dead end with it, does the control panel/switches on a used part have to be identical part numbers a new unit is over £800 and id rather put in a used one if i can.

thanks