I think the two photos (1 tintype) look quite a lot alike. Several years ago Scientific American or the Smithsonian Magazine did an analysis of the BTK Photo and a photo of Brushy Bill of Hico,Texas fame. They showed without any doubt that they were not the same person. Even after all that people still believed that Brushy Bill was Bill the Kid. Some things never die.
One of the BTK documentaries did a similar analysis (maybe the same one you referenced?) and came to the same conclusion. The authenticated tintype (which some actually doubt is really BTK) shows a... more