Specifically relating to the products- rather important here, you don't want to be misdirected by the terminology:
Energy= carbs, no electrolyte.
Electrolyte: Carbs (36g per serving as opposed to about 50g in Energy) and electrolytes.
SIS themselves say. "As part of your carbohydrate loading strategy, consume up to 4 servings per day with or between meals to help achieve elevated carbohydrate intake. SiS GO Energy can also be consumed with SiS GO Energy bars to further boost carbohydrate intake. To provide both optimal energy and hydration during exercise, SiS GO Electrolyte is superior to SiS GO Energy".