Pork belly is just that... raw pork. Salt pork is pork belly that has been brined or packed in a salt/sugar rub for about a week. Bacon is salt pork that has been smoked. It’s the smoke that makes it. Same way, corned beef is brisket that has been aged in a brine. Pastrami is corned beef that has been smoked.
So,,,, pork belly is not worth frying up with some eggs for breakfast?