South Africa's Damian de Allende was red-carded late on for an elbow.
The Springboks suffered a 25-24 defeat in Cape Town on Saturday, although the performance was a vast improvement after the humiliating 57-0 loss they suffered at the hands of the All Blacks last month.
"I'd say that affected the tackle count too because we made a hell of a lot of them so I'm not sure why we didn't kick it out, but we'll talk about that come another day". The difference was the All Blacks' ability to seize game-changing chances.
McKenzie, who has also played on the wing and at flyhalf for the Kiwis, said after Saturday's test he had no preference.
Over 90 minutes (the first half ran to 50 minutes) the Boks were the better team.
"57-0 is much easier on the ticker".
"There's no doubt that try was the catalyst for us winning the game".
Australia's second-place finish in this year's edition of the Rugby Championship has seen them climb to third in the rankings at the expense of Ireland and South Africa.
The champs also came through after losing playmaker Beauden Barrett to a head knock midway through the first half, and unsafe winger Nehe Milner-Skudder to a dislocated right shoulder at the end of the half.
Trailing 8-3 at the break, the Springboks snatched a 10-8 lead soon after the resumption through halfback Ross Cronje's sneaky try, but they gifted New Zealand flyer Rieko Ioane a crucial 80-metre runaway try in the 60th minute via a loose pass.
The result in Mendoza meant Australia overtook South Africa into second behind New Zealand, while Argentina finished bottom of the table.
South Africa responded again with a bust by Marx, who put Du Preez clear.
Over the near eight year reign the All Blacks have claimed two World Cup titles and played 106 tests, losing just eight with three draws.
"It'll give our younger players who haven't been in that situation before a little bit of belief that even though it's tough, you can find a way", Hansen said.