Per the pinouts shown on Service Manual Pages 8W-80-62 and 8W-80-63:
- SKREEM Connector C1 (the big one) pin 6 is the RKE Antenna and pin 7 is its shield
- Connector C2 (the white 2 pin) is the CAN connection
- Connector C3 (the black 2 pin) is the SKREEM Sentry Key antenna
So, you CAN'T swap antennas; they are Murphy proof.