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"Would the amounts not be equal?"
Not quite. Base Power is only part of the formula. It's hard to see in plain text, but I'm not allowed to post links until I have five posts. Look up "damage formula" on bulbapedia if you need something with better formatting.
Damage = (((2 * Level + 10) /...
But you'll get the same multipliers twice if you use the move twice, right? And the critical hit will be twice as powerful, but you'll also only get half as many crits due to attacking half as often.
Although, this brings up another question, come to think of it: does Charge double the damage...
Why not just use the electric move twice?
I understand that Nintendo made it also increase Special Defense in later gens, but it's learned so late by so many Pokemon in Gen 3 that there must be something I'm missing that makes it quite good here too. The closest reason I can think of is...