make a save for the ntsc version extract the pal version with savegame manager gx change the last 2 letters on the folder of the pal version from 50 to 45 reinstall and it will work on your ntsc copy.
That may work. Otherwise use Savegame Manager (Don't use GX, it's very buggy), change the 50 on the folder to 45 (like above) and then hex the save and change the TitleID from "XXXP" to "XXXE". Then re-insert the save. You have to do that for NSMBWii.
gx isnt very buggy anymore and no need for hex editing anymore i havent had to hex edit a game save sense nsmbw and i have converted about 40 game saves.
