The cards will work, however, the game will only work on North American region 3DS'. The Australian 3DS is PAL region and can't play NA 3DS games.
Just go in and change your preorder to the Mark of Mastery edition once GameStop has it in their systems. If you wait until release, they probably won't have any because they only get shipped however many were preordered.
Just go in and change your preorder to the Mark of Mastery edition once GameStop has it in their systems. If you wait until release, they probably won't have any because they only get shipped however many were preordered.