I thought they were the same but it had me puzzled with the $3 price difference, the ac costed more. I just decided to go with it, also just ordered a ac thermo stat and ac water pump with the metal and rubber gasket, so with the new uim and lim gaskets most of the system will be new, figerd it may be a good idea with me driving over 600 miles a week now lol jst gotta do a good flush and get the dex cool crap out