Australia and Europe both use -RW controllers and Instant access points, so there's no issue moving an AP from Australia to Europe.
Aruba has (up to) 5 different regulatory models for controllers and instant (or unified) access points: US, JP (Japan), IL (Israel), EG (Egypt) and RW (rest of world).
Note also that if you have a controller-based deployment, the "regulatory identity" is defined by the controller, and you can use any AP.