indeed. they use 10 KHz, we use 9KHz.
Plus FM, the equalisation settings in USA are different to NZ (and rest of world) - IIRC it's 15uS vs 25 uS. Plus fine tuning is slightly off in NZ with a US head unit.
How do I know this? Apart from being a bit of a tech geek and having studied this stuff many moons ago at tech, I purchased a really nice Kenwood head unit in USA in the mid-90's to bring back (2nd to top of line I think). I knew the risk I was taking. The tuner was excellent, though never quite right down here. Tape deck was superb. I had it in a couple of cars, left it in a Sentra I sold along with some Magnat speakers. I doubt the new owner appreciated what they had.
O.P.: The more modern kit may well have software configurable settings for local radio. Why not just buy one locally, save the shagging around?