I would suppose you could swap them if you wanted to change them. Wouldn't it be a matter of swapping what's in position two with the wires from position one?
For me, the Unit #2 control is moot since the front A/C does not have any provision for running the control wires to the thermostat. Unless I wanted to work much harder or pay a higher price, I would have to fish these wires appropriately. Alas, I will be lazy and cheap and just buy an independent unit that just aims down into the bedroom and any left over cooled air can creep into the rear part ot the Monty to help out the rear unit.
Whatever works.
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