Ameliaranne Ekenasio (27/29) scored what proved to be the winner with barely 20 seconds left on the clock,with the Diamonds'last attacking assault chopped off by Langman to secure New Zealand's first triumph on Australian soil since 2016.
It means the Silver Ferns can win the Constellation Cup for just the second time if they prevail in Perth on Sunday,in what would be another statement of supremacy to back up July's World Cup final win over Australia.
"It would be massive,"said Langman,who was crowned MVP of the match. "It's an opportunity for us,especially after the World Cup. We really do want to send this new-age Ferns[team] into the future and have a little bit of dominance on our side."
The Diamonds have won the trophy eight times in the nine years it has been contested,including the last six in a row,and can still win this year's edition on goal difference if they beat New Zealand in Perth.
But coach Lisa Alexander said she felt tactically hobbled by the absence of Paige Hadley,who will miss the remainder of the series due to a fractured wrist sustained in Wednesday's game two in Auckland,and watched on from the sidelines along with the biggest netball crowd anywhere in the world this year.
"I see that very starkly now,"Alexander said."That's what's disappointing because I couldn't make the changes I probably would have liked to have made just to freshen up the centre court a bit more."