We have the same examiners as you do. They fly out to NZ twice a year for the sole purpose of aujudicating the exams. For example the one for my next exam lives in South London usually. I think they come for 4-6 weeks. So theoretically our exams should be marked to exactly the same standard.
But then again ... sunshine, on holiday, seeing the sights, away from home stress, freedom ...
BUT MAYBE
homesick, staying in a horrid motel, missing their family, jet lagged
Oh no .. which will my examiner be