if everyone was exactly like you, then you’d be just one person in one space at one time.
if everyone was duplicated from you and placed all around the world… then there’d be a bunch of yous who understood eachother fairly well… for a while.. since each of you would instantly have different experiences of life based solely on your physical location and sensory experience. You’d all start thinking different things quite quickly.. and eventually everyone would become different. I mean, you’d all have the same foundational understanding of the universe as a starting point but you would grow new, separate understandings as you go.