Question: are there different amp gfci outlets?
Answer: The amp rating of the receptacle and circuit do not depend on whether the receptacle is a GFCI or not: If you have a 15 amp circuit, you must have 15 amp receptacles. If you have a 20 amp circuit, you can either have 20 amp receptacles, or 15 amp receptacles if there is more than one (e.g. a duplex receptacle).