"Aye, there's the rub", to quote Shakespeare.
In short, there's no such beastie, as NZ Governments have never seen fit to publish Census records in the way the UK has done.
However, there are other ways. As an example, NZ school Admission-Discharge-Withdrawal registers have been described as a census in their own right, but are harder to find.
The NZSG have complied lists of cemetery fiche by area (no national index available as far as I know), and while not complete it's very useful.
Trade directories are handy too, but often lag behind an individuals' movements.
Cheers, riley