Pork loin is a larger cut of meat and comes from the backbone of the pig. Pork loin is noticeably wider than tenderloin so the methods of cooking it are entirely different. Pork loin is best cooked by grilling or slow roasting while pork tenderloin is typically cooked over high heat. Therefore, the two should not be used interchangeably in a recipe.
Pork should be cooked to an internal temperature of 145 F/65 C
Heritage Breed Pigs