72 heater a/c vacuum switch

Is there any real difference in these switches? I thought mine just needed to be cleaned up and lubed , but when I opened it up the flat pieces inside were chewed up. I just bought a nos one on ebay that looked the same but I notice that there are a few different part numbers. Prices range from 40 to 300. The only difference that I can see is one of the connectors is in a slightly different position. Does anyone know if there is any difference