Instrument Cluster Circuit Board Interchangeability

The dealer's mechanic said that the cluster printed circuit board was faulty, and he couldn't fix it because the repair parts for '91 Chrysler products were no longer available. I located a used circuit board at an auto salvage yard, but the part number on it is not the same as on the one in my van. The part # of mine is 4773077, and the one I located is part # 4517807 followed by Rev D. Are these two boards interchangeable or not? Will the used one work in my van? Thanks, WFrankB