Pork loin and tenderloin come from the same general area of the pig. The pork tenderloin runs along the backbone above the pork loin. You can substitute pork tenderloin in this recipe to make BBQ pork tenderloin. Just like pork loin, the tenderloin is very lean, so be sure not to overcook it. The tenderloin takes a marinade very well and can be slow-cooked over indirect heat or cooked over direct heat on the grill.