It seems that is T15s, the 15 pin red connector in the ECU box. It would be a 16 pin connector except the location for what would be pin 10 is skipped and pin 10 is where 11 would be if it were a 16 pin. According to the wiring diagrams I can find in the Bentley manual the pinouts are as follows (cavity#, wire color, connects to):
1, GRN/BRN, ABS control unit
2, BLK/YEL, Heated rear window (rpm boost)
3, BLK/GRY, Climatronic/A/C switch off
8, WHT, Aux heat switch
9, WHT/YEL, High heat output
10, WHT/BLU, Low heat output
14, ORN/BRN, Low bus
15, ORN/BLK, High bus
I don't know think that 8, 9, and 10 are used on the dash harness for our NA BHW. The wiring diagram indicates that it is for additional heater applications and the wiring from 9 and 10 indicate "BGW only"
Since you are doing a swap you probably only need 14 and 15 since it is the CAN bus to the OBD connector through the CAN gateway. I don't know how that works with swaps where you don't use the cluster. Also, I'm not an expert on swaps or how the CAN bus communication works. This is the best I can gather from the wiring diagrams.