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The following quote from I have a Working Holiday Visa but want to enter New Zealand as a visitor explains your situation quite clearly (emphasis mine):
If you insist on entering New Zealand as a visitor instead, your Working Holiday visa will automatically be cancelled if you are issued a Visitor Visa at the border however not everyone is eligible for this and you could be refused entry.
Because you have a different passport number than when you originally were granted your WHV, it is possible that this may not happen automatically. However, they will catch up to you when you try to transfer your WHV and they realise what you have done and would not hesitate to cancel your WHV manually.