Shareholders of both firms approved the deal in separate meetings earlier this year.
The central bank downplayed the rebound in first-quarter inflation.
The kiwi has failed to sustainably push below 68.50 US cents in the past few weeks.
Record migration and low interest rates have bolstered the country's housing market.
Local data today includes April house sales figures and manufacturing activity.
Meanwhile, the outlook for the currency remains critical.
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