Hmmm....
This is what I got from their website (FAQ):

Are all applicants required to undertake an examination as part of the application for registration process?
There are no mandatory examinations set by the Board. However, in certain instances where evidence of competence has not been adequately demonstrated in written documentation an applicant may be invited to undertake competence examinations at their own expense in New Zealand to enable them to demonstrate their competence in the clinical setting.
Regards,
Fyzzio