New Zealand uses three flat plugs with a voltage of 230 volts, that is, the plugs are eight plus 1 ground. The eight-character plug without ground wire can also be used in New Zealand, and household appliances can also be used there. Because the household appliance is 220V, it is enough to bring a travel plug adapter.
What I said may be more complicated. You'd better check the conversion plug of the travel plug and find out for yourself. Words are more detailed than pictures.