@RegularJoe thank you! This is quite interesting. I'd forgotten about the celebrity look-alikes you mentioned. I'm not surprised the studies aren't there.

@RegularJoe I'm curious about how this might work across ethnicities. I can't point to a photo, but several times, I've noticed people from other continents who could easily be someone I know here, except they're African, or Asian, when the person I know is white, just for example. Under the expected differences in hair, eyes, etc, the basic facial structure is the same. A DNA match seems less likely in these cases.