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As stated already, sistering the studs will be perfectly fine unless the existing studs your speaking of are rotten. If thats the case we would use a Dremel with a cut off wheel to cut the drywall screws/nails without damaging the drywall and get the rotten studs out. Works a lot better than a Sawzall.
Don't use treated wood for the framing/studs. It has a high moisture content 20%+, which is why its for exterior use only. It could cause issues later. Good luck!
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