Wii save region info location?

Where's the region of a Wii save located? Is it at the same place for all saves?

OR:

Does anyone know a good way of finding it out?

I think the Tanooki NSMB Savegame Editor can convert from one region to the other, apparently its a single byte change (or at least its not a big change, may be slightly more than one byte). So get an NSMB save, and convert it and compare the two versions.