Hi Kieran.
You will be fine with those radios. Even if they are not NZ spec ones it is unlikely you will cause a problem with them, or that anyone will realise and even care. If you get an interference just choose another channel.
With our terrain, I think you will be surprised just how small the range from them is. If you position the antennas as high as possible and keep them clear of other metallic objects you may get better signal.
Welcome to NZ, and please do be careful on our roads - they regularly catch out tired tourists with all sorts of nasty tricks. Motorcycling mecca for sure, but also many traps even for the experienced.
Steve
"I am a licenced motorcycle instructor, I agree with dangerousbastard, no point in repeating what he said."
"read what Steve says. He's right."
"What Steve said pretty much summed it up."
"I did axactly as you said and it worked...!!"
"Wow, Great advise there DB."
WTB: Hyosung bikes or going or not.
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