This costs so little that my brain would burn more value in noodle calories just doing the math to figure out how much I pay for like 1 joule of electricity.

How many noodle calories are equal to one potato calorie?

Strictly speaking they're equal; a calorie is 4.184J by definition.

But a correct answer depends on bioavailability, which is subject to the noodle recipe, the potato variety, his they're cooked, and the eater's own physiology.

Which is heavier: a ton of bricks or a ton of feathers?
The short answer is, we have no idea!