Currently New Zealand is listed to use the AS923-925 frequency plan. This is from 923.2 to 924.8MHz so that it fits into the 921-928MHz band.
According to the website of the New Zealand Radio Spectrum Management the SRD band was increased on 24 December 2015 to match the band in Australia (915-928MHz). The new regulations indeed state these new band limits and the Australian frequency plan does fit into the new New Zealand band.
My recommendation is therefore: Use the Australian frequency plan (916.8-927.5MHz) in New Zealand.
Someone else’s comments about this: https://kotahi.net/radio-frequencies-bands-and-inspections/