Anything is possible, but it would kind of be like finding two pc-clones, both which contained a copy of MS-DOS, and concluding that each was independently prog

Anything is possible, but it would kind of be like finding two pc-clones, both which contained a copy of MS-DOS, and concluding that each was independently programmed. For the kinds of arguments which scientists use to support these claims, see "Altitude adaptation in Tibetans caused by introgression of Denisovan-like DNA" by Emilia Huerta-Sánchez, et al.