Customs at AKL is much stricter than OZ. All bags are screened for food, plants, seeds, wood products etc and fines are compulsory. In Oz they are able to issue warnings and don't necessarily X-Ray every piece of baggage.

From memory I believe you can bring in 6 bottles of wine to NZ and upto 50 cigars so you should be fine. You should also be able to find good NZ (and Oz) wines at DF in AKL; spirits seem to be a few dollars cheaper in AKL, haven't checked wine prices though.