looks like thats the one that uses PWM to math out the position of the EGR it'll have 2 wires controlling the motor, 1 wire providing power to a sliding switch that will close to one contact when the EGR is fully closed and the other when fully open.
The other type uses a wiper resistor the same as the TPS on an older injected V8.
if memory serves the type with the contacts can be made to fully close but the one with the wiper cant. The ECU is configured to run with one or the other, if it expects the wiper signal it will get upset with a no flow situation from the EGR but the one with the contacts will allow you to have a fully closed EGR.

