Pork Belly and Side Pork are the same thing.
The pork belly yields a side of pork and so it's pork belly or side pork and there's no real difference between them.
Salt Pork and Pork Belly are the same meats.
You may have also eaten salt pork or belly pork without even realizing it as it's used in a lot of dishes.
Salt Pork is most commonly made from pork belly meat.
You can freeze salt pork to extend the life of the salt pork and prevent spoilage.
Salt pork can be kept out of the refrigerator at room temperature for up to 2 weeks but if you plan to keep the salt pork longer than 2 weeks the salt pork needs refrigeration.
Refrigerating salt pork makes the salt pork last for up to 3 months.
If you freeze the salt pork you extend the life of the salt pork to 6 months.
Frozen salt pork lasts for up to 6 months before it goes bad.
Salt pork does eventually go bad so you need to use it up within 6 months of freezing it.
It used to be back in the old days that salt pork was cured really good that it would last without any refrigerator and could be taken on very long journeys without the risk of spoilage.
But salt pork made today is not as rigid and cannot last long without refrigeration.