What’s the Difference in these Campbell’s Soups?

I got these four cans of Campbell’s Chunky Soups -Beef with Country Vegetables, Savory Pot Roast, Sirloin Burger with Country Vegetables, and Salisbury Steak with Mushrooms and Onions. Then I realized, “Wait, aren’t these all the same soup?”

Well, I’ve tried them all. The Sirloin Burger and the Salisbury Steak are made from grounded up beef, shaped into chunks. The Beef with Country Vegetables and the Pot Roast are actual chunks of beef, to which you can see the muscle fibers when you bite into it. The Salisbury Steak also has mushrooms.

So yes, they are all basically the same soup with beef and vegetables.