It all depends on whose terms the fight occurs. At <10k the Pony will be at a marked disadvantage to the LA7, at higher altitudes the Pony will gain an advantage, and that advantage will increase with altitude. A Pony has a reasonable chance of winning an engagement against an LA7 in the LA7's low altitude "home" if he brings enough E to the fight. An LA7 is nearly hopeless against a Pony at his "home" of altitudes greater than 15k.
But in AH, everybody ends up on the deck, or dying on the way to it... Beware the LA7