Auto Z06 cars 17+ will still be likely to overheat on track due to the fact that they did not get the auxiliary cooler installed (a transmission cooler is already in that spot). The 19 Z06 A8's will still have some issues as while the radiator did get a bit bigger and the intercooler pump improved, it is just not a viable track car.
The M7 Z06 17+ cars have the good odds of not overheating on track, with the 19's standing the best chance. It is all thrown out the window if the intercooler system is not bled properly.