On the Food network they boil potatoes, but they poach carrots. They poach turkey, but they boil eggs. They sauté' onions, but they fry eggs in the same pan. Likewise, they fry hash browns, but they sauté' onions in the same pan before adding the potatoes.
I can go on for days.
I think you saute at a lower heat than stir-frying
I guess you replace the oil with the extra stirring to stop it sticking when you stir-fry