Good luck...I truly hope that the swap of the hatch itself is doable even if the SCA feature doesn't work...at least that would open up multiple opportunities for finding a replacement hatch.
An example of relay differences...the SCA K112 relay is the purple one on the far right in the diagram below for the face-lift models.
On the pre-facelift models...the relay location on the far right is for the rear electric seat adjustment:
FACE LIFT "REAR" RELAY LAYOUT
PRE-FACELIFT "REAR" RELAY LAYOUT
