(1) If a medical treatment decision maker or a support person is appointed in another State or a Territory and the appointment complies with the requirements of that other State or the Territory then, to the extent that the powers the instrument of appointment gives could validly have been given by an appointment under Part 3, the appointment is taken to be an appointment of an appointed medical treatment decision maker or support person (as the case may be).
(2) This section applies whether the appointment is made before, on or after the commencement of this section.