[OrlyP]

Try this:

Set your multimeter to test diodes and put the BLACK probe on the AVR's Red wire. Use the RED probe and check each of the Blue and Yellow wires and see if you can get a half a voltage drop to appear on the meter.

If you find it, that color pair (whether it's Blue and Blue or Yellow and Yellow) would be for the excitation winding. That means, the remaining pair would be the sense wires.

Do the same procedure on both AVRs to see if their relative position on the connector is the same.

These AVRs are made by different manufacturers in bulk. They don't often adhere to wire color codes. Even the wires that goes to the brushes are oftentimes not color-coded correctly.... and those are polarity-sensitive. Most would have a tag that tells you which one is the positive (+) wire going to the brush.