A BMW and a Yugo are similar but totally unrelated..
Human Beings are actually a result of gene splicing experiments by alien visitors to this planet, using segments taken from chimpanzees (or possibly other great apes) and swine.
In fact, many body parts from swine are entirely compatible when used as a transplant in human beings.
Just like parts could be taken off a BMW and adapted to a Yugo.
And yet share many of the same licensed patents or now-public domain technologies.