[Scootch]

Lots of factors here.
Sound hole size, wood, bracing, build quality, action, strings and on and on.

I've had/have guitars that are quite loud at the expense of the bass end.

I'd suspect that two guitars, of the same wood, same everything but size, would have the larger guitar louder.

However adjustments might skew that if you changed the sound hole size, etc.

I once read that a larger sound hole made more bass but a smaller sound hole gave more volume. Or it it the other way around? It's too late, I'm getting sleepy.