zlacker

You're talking about literal identical voice due to throat development and cultural background etc - which is obviously technically true, but I imagine a number of people who sound 99% like you(where a casual listener can't tell the difference) must be quite large.

Case in point - my wife has two twin brothers. Even though I've been interacting with them for over 10 years now, they sound exactly the same to me. If I close my eyes then there is zero chance I could tell them apart by voice alone. I know, it's an anecdote - but while I'm sure you could tell them apart by some really small thing that they do, to someone who isn't actively looking for those cues they are - for all intentions and purposes - the same.