The touch plate system uses ratcheting relays, that is to say that the same signal comes from the switch for the both on & off operations. It only requires 2 wires to control the relay. (additional wires are needed in case of a pilot light on the switch to tell when it's in the on position). The low voltage pigtails on the relay are brown & red, if I remember correctly.
GE (and Sierra) use separate signals to the relays for on & off, so requires 3 wires run to the switch. The low voltage pigtails on the relay are black, red, & blue. Blue is the common conductor, red is the on signal, and black is the off signal.
Either system uses a momentary contact switch.