they differ in voltage (110V vs 220-240V) and frequency (60Hz vs 50Hz). The former would be easier to adjus than the latter. In the past, when "Europe X10" was insanely expensive, some people did resolder some units. You might want to test your google foo on that. But be aware that this is not simple and might burn your kitchen sink.
For 16 220V relais outputs, I would probably get KNX/EIB or do some arduino based DIY thing..
We also support the AET EMC2000 (http://www.austroinfo.at/aet/Default.asp?ProduktID=1
) btw, but I'm not sure if getting one of those units is feasible..