It is easy to look at the Antarctic and say "Hey, it's cold just like the Arctic!" but they are radically different landscapes and biomes. The various native groups that dwell in the far north have, over painstaking centuries, assembled a lifestyle and techniques to survive in some of the harshest places on Earth and they are tuned to do very specific things in very specific places. Much of that would be useless if you dump them at the other end of the planet. All their intricate knowledge of the animals, plants, migration patterns, navigational tools, exacting knowledge of local climate, and geography would be worthless, indeed a hindrance.
The Arctic is a ring of land that surround a frozen pole of sea ice (at least for now, climate change). The land, at some parts of the year, is actually very rich in both animals and plants, if you know what to look for. The sea ice is a varying landscape but, at various points can provide seals and other food sources if you know how to get them. Most importantly however, the land is always there, a place to regroup, winter over, or even retreat to if you have to. Antarctica is the reverse, you have (generally) bare, wild seas and then a harsh, mostly frozen land. Even where it is bare, the Dry Valleys of Anarticia are probably the most inhospitable landscapes on Earth. It would never work unless you set up a base and regularly delivered food, supplies and such. If you do that, why bother with Natives? Just send a scientific base, as we did in OTL.