Allison! The Finns in the UP would tell you that a true pasty is beef, rutabaga, potato, onion and carrot in a lard-based pastry crust. They were called "hand pies" and were lunchbox food for the copper miners. People get in fistfights up there over whether they are supposed to be eaten with gravy or ketchup.
The problem with bread-based crusts like the calzone is that they would soak through in time and get soggy. Pasties, with the lard, can be just fine sitting in a lunch box for hours.