Like someone commented on your other post, I'm not aware of any NZ English dictionary. Spelling is generally done with UK English spelling (with a lot of American spellings leaking in these days), but in terms of pronunciation I don't know of any consolidated dictionary.

Often you can search up certain words on youtube videos just by searching for "NZ pronunciation of [word]. The wikipedia page here might help as well, but it's pretty technical.

There are also videos like this one, that try to teach an NZ accent by focusing on sounds that make it unique, though her speech in that video sounds to me like someone trying to do an NZ accent rather than a native one, but it might still help.