Yes, they are both from the same fish.
Tinned tuna, or aluminum foil bagged tuna, is a shelf stable product. You put the tins in a box and put the box on a ship and it’s still good when they unload it onto the store shelves. All the processes before it was put in the tin are necessary for this to be safe. Tuna steak is a piece of fresh fish, and it has to be refrigerated at all times, particularly in transit, or it will go bad. Refrigerated processing and shipping costs a great deal more, and must be done quickly (which also costs more).
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