The 5pin has two pins in the 5 pin connector for the CAN H / CAN L, and two wires for 12v switched, and GND going into a 4 pin Deutsch DTM connector. (CANJST)
The 4pin has 4 pins in the connector for CAN H / CAN L, switched 12v, and GND without any other wiring required. (CANJST4)
These models use the 5 pin:
These Models use the 4 pin: