A couple of years ago I read a critique of the different poll questions that measure support or opposition for New Zealand becoming a republic. It was a fair and reasonable critique – but I can’t remember who wrote it or where I saw it (happy to link if someone can find it).
One of the points related to Colmar Brunton’s question: Do you believe New Zealand should become a republic, or stay as it is, with the Queen as head of state?
This question only mentions the possibility that a Queen would remain head of state. If I recall correctly, it was suggested the result may be different if the question mentioned the possibility that a King could be head of state (presumably because people may feel more or less positive toward Prince Charles than the Queen).
In the most recent Q+A Colmar Brunton poll, the question was revised to read: Do you believe New Zealand should become a republic, or stay as it is, with a King or Queen as head of state?
Interestingly, the result was no different from 2012.
Perhaps there actually has been a change, but it’s masked by the change in wording. For example, it’s possible support for the status quo has increased since 2012, but including ‘King’ has offset this. On the other hand, opposition to the status quo could have increased, but this has been offset by more positive feelings toward either Prince Charles or William.
Who knows? It’s still a better question.