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The same way a .50 cal machine gun has the same firepower whether it's man-portable on a tripod or mounted on a tank, it's the same gun. An assault cannon is an assault cannon, a lascannon is a lascannon, etc. Things like ammo capacity, where the size of a dreadnought or tank would start to matter, have no impact on the short duration battles 40k is supposed to represent.

Flame weapons used to have two different template sizes back in 2nd edition, but they got rid of that, so now everything, no matter how big, basically uses the same template (at least outside apocalypse games).