I made a new collage of Oswald and Doorman, and my purpose in doing it was to compare their ears.
Those ears match very, very well. But, note that the shirt, the t-shirt, the eyes, the length of the forehead, the length of the neck, the shape of the head also match very well. There is simply no doubt whatsoever that we are looking at the same man wearing the same clothes. There is no way that is not Oswald on both sides of the collage.