One of the most important things to consider here is turret ring size. Will the borrowed turret even fit the vehicle? Will you have to make a new deck & turret ring to fit the borrowed turret to the hull?
After that are the various requirements for turret rotation (mechanical, electrical, manual, etc. etc.) and installing the needed components.
Before that you have to find out whether the vehicle (or turret if giving it a different weapon) can handle the recoil of the weapon because that would mean extra gear to counter recoil forces.
Then there's the ammunition feed & storage. They will have to be changed to accommodate the different ammo requirement.
If you're just cramming a different (and larger calibre) weapon into the vehicle's standard turret, how crowded will this new weapon make the turret?
It's for all these reasons that I suggest making this sort of conversion a side-adventure for any Players who want to convert a vehicle. Finding a vehicle already converted is a different situation and I'm not attempting to address that.
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