That's interesting. They probably wire the MOVs on the North American version from phase to ground in addition to line-to-line. So the phase to gnd MOVs are rated for about 130v. Since the EU version is wired phase to neutral which is 230v, it would quickly blow the MOVs that are rated 130v (at least one of them). I guess I'm used to power supplies that only install the MOV between the two lines so they avoid this issue. Clipper Creek's method offers more protection but requires different components for each continent.
You learn something new every day!