Powerade has about 50% more electrolytes AKA salts than Gatorade does.

But that's also part of the trick. It's not just sodium chloride. The potassium is monopotassium phosphate, a salt. Sea water is 3.5% salt and almost all of it is sodium chloride. Gatorade is only about .25% salt. Sea water has 14x the amount of salt as Gatorade