What the British (and other Europeans) have done in America and Australia is what the Turks have done to Asia Minor. This was centuries ago before the existence of any kind of international law or recognition of the human rights of all people. Just because things like slavery and racist discriminations were the norm centuries ago it doesn't mean you can do the same today.
The Kurds are a nation with a specific territory where they are the majority of the population now and for many centuries, long before the Turks occupied their lands. They are like the Scottish in Britain. The Kurds didn't "steal" Kurdistan from the Turks, just like the Scottish didn't steal Scotland from the English. Their territory belongs to them, and it should be up to them to decide if their own territory should be part of any other country or if it should be independent.
On the other hand the TCs are minority and no specific part of Cyprus belongs to them. They illegally occupy the north part of Cyprus something which they have no right to do, since this is the homeland of far more GCs for millennia.