Pork loin and pork tenderloin are two different cuts of meat. Pork loin is a larger cut from the back of the pig and can be sold bone-in or boneless. It is typically roasted and can be sliced into pork chops. On the other hand, pork tenderloin is a smaller, long cut from the muscle that runs along the backbone. It's a leaner cut and can be cooked quickly over high heat.