Ahh, okay, yes I thought it didn't sound right tht there would be no differences...
With regards to wiring, I only got the front half of the loom with the STi cut, will be using the RX rear half loom.
Small update:
Half-cut compression tested (150 @ all four cylinders) and running prior to being delivered safely along with the car to the guys at STechnic to begin the magic! Exciting times