I have several Dell servers. How compatible are their power supplies with each other? They are R760 with 0FR0KX, R750 with 0J9N6W, 0FR0KX, 0MGPPC, 06C11W & 01CW9G in one unit, 0FR0KX & 0J9N6W, 0G6CCK, 740xd with 0CMPGM, 0Y26KX. They all look the same, but what is their compatibility at the firmware level? Can I take the 1100 watt power supply from the R760 and put it into the R740