63-65 dart wiper motor

Anyone know if there is a difference between the 2 speed motors and the variable speed motors in the 63-65 darts? Both seem to have the same 2 plugs. One is dark blue/Black w/tracer and the other is yellow/red. I currently have a single speed with just the dark blue/black w/tracer motor but have a switch for the variable speed motors from a 64. Can I just hook up the dark blue and black wires and still have my motor work or do I have to change to the 2 plug motors? Main reason for changing the switch is to add the pushbutton for the washer pump which I know how to wire that to the switch.
Author: admin