We have a quick question about the older Ultravac. Is the unit the same and compatible with both the UltraVac AND the TriVantage deck, or is/are there difference(s)? I know there as something about different numbers, but I don't know what the differences were. It is possible that it may be irrelevant to us anyway at this time, but atleast we will all know for future reference. Any help is greatly appreciated.