encoder question

I have recently picked up some old electrocraft servos. They have renco encoders. I found an old post that shows what wire colors are used for a a- b b- power and ground. I think that will most likely work. The issue is I now have single to differential converters from cncpc that are connected up on the machine to each axis. Can I just use the a, b, power and ground to go through the boards like before or do I need to cut the ends off the cat 5s and wire all the wires directly(a a- b b- power and ground ) and remove the very handy wiring of the cnc4pc boards.

Thanks
Ben