ExSp33db1rd
Looking at the UTMS frequency list you provided.
New Zealand uses UTMS 2100, 900 and 850.
The iPad specifications are here. New Zealand will work fine.
https://www.apple.com/ca/ipad-air/specs/
UMTS/HSPA/HSPA+/DC-HSDPA (850, 900, 1700/2100, 1900, 2100 MHz); GSM/EDGE (850, 900, 1800, 1900 MHz)
CDMA EV-DO Rev. A and Rev. B (800, 1900 MHz)
LTE (Bands 1, 2, 3, 4, 5, 7, 8, 13, 17, 18, 19, 20, 25, 26)3
I have used my Australian iPads / iPhones in New Zealand with no issue, using a Travel sim from
Travel SIM | FREE Roaming | International SIM - MySims2Go
I haven't tried the Global Gig sim yet as I have not been to NZ since buying it. But I am sure it will work fine.
One thing I just learned, iPad 3 and above and the Minis also use Glonass in addition to the US GPS system.
iPad - Wikipedia, the free encyclopedia