In theory, you could take an international unit(which runs on 50hz power), change the plug, and it will work on North American 60hz power. YMMV. 
I am not saying you are wrong, but domestic 240V is 2 phase (two - 120V hot wires compared to the neutral / you get 240V difference between the 2 hot wires) and European 220V is single phase (one 220V hot wire compared to the neutral connection). It does not seem as simple as switching out the plug, especially if the controls are expecting 220V between the hot leg and the neutral / ground connections. This is definitely out of my electrical expertise, but a couple google searches seemed to imply it is not that easy, at least in some cases.