In terms of Graphics performance:
Differnce is like 300%+ when docked (x3 performance).
Differnce is like 800%+ when handheld (x8 performance).
3/4ths of 1310 Gflops = 982 Gflops.
The Tegra X1 in Switch? No.
This Apple A12X? Quite possibly. Wouldn't surprise me at all if its 3-5x stronger of a chip. Wouldn't surprise me either if Nvidia also has a similar chip to this in the prototype stages that Nintendo might want to take a look at. When Tegra X1 launched it was basically about as good as the Apple A9X (the equivalent chip at that time) only it was on less efficent node (20nm instead of 10nm).