The controllers will be the same. However the power supplies should have different ampere ratings. I can't remember off the top of my head, I will need to look later. Since you have two of the RW-8s and one of the RW-4 you can just look to see which two of the three supplies have the same ampere rating and those will be for the RW-8 and the other for the RW-4.
If you turn the power supplies over to where the prongs are you should see the specs of the supply 24VDC 1A etc.