If I visit China on a NZ passport, do I need a re-entry visa for PRC if I go to Macau briefly?

Downy, in most cases, you need it if you re-enter PRC.
But if you fly to a Chinese city from Macau and stay in the city for less than 72 hours, after that, you take a flight back to your home country. In this way, you may enjoy free transit and you don’t need to reapply for an entry permit.