Their definitions are different. The pig keel is the back of the pig, and the pig spine is the bone of the pig spine. We can see from these information that they refer to very similar things, so some people use them to refer to the same thing. Pig keel and pig spine contain a lot of bone marrow, which will be released when they are cooked. What's the difference between pig keel and pig spine? The definitions and explanations of these two things are different. Pig keel refers to the back of pig. Most of the meat in this place is thin and has less fat content. Pig spine refers to the bone of pig spine, which contains a large amount of bone marrow.
Although their explanations are a little different, we can still see from these information that they are two very similar substances, so some people will use them to call the same thing.
Pig keel and pig spine contain a lot of bone marrow. These bone marrow will be released when we cook pig keel and pig spine. They can be used to make adjustable positions or Italian stews.