That he shifts so easily and readily from category to category—on the left he's a sentient being, on the right a delicately ruffled chunk of meat—is only part of his charm.
Separating them is a gossamer thread. Each self, each half of the whole, can regard the other with grace. "Hello, Brother Who Shall Be," says the living pig. "Hello, Brother Who Once Was," says the dead one.
Like you, we are reminded of this dramatic representation. Before and After shots of this kind are always sobering. For us, at least. For the pigs, they are merely confirmation of the rightness of life, a validation of The Way of Things. Which is why the Before pig here is quietly pleased with his situation. Here, alive and smiling; there, dead and sliced by practiced hands. Six of one, half dozen of the other.