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So i know MC rules say they can fire 2 guns a turn, so in theory could the exocrine be able to fire both shooting types it can do in one turn, or would that count as the same gun and only get to fire once?

I think the BRB covers this kind of things by saying you may only use one profile each time or somesuch.
Will look for a reference

Page 51

2 guns the cannon is one gun with 2 profiles.

So is the cannon 2 (yes I am aware fluff is multiple guns) guns.

Answer this and you get your answer

The have permission to fire two weapons, not the same weapon twice.

So no would be the answer.

Iranna.