On top of what the other posters have said here – our brain is also highly trained to notice these differences in everyone’s voices and be able to pick up on even very subtle ways to identify individual voices.
Our voice organs are more complex than most animals but this isn’t unique to humans either. Almost every species will have individually unique “voices”, we’re just often not as skilled at telling the difference. When you hear two different birds call for example they might sound the same (or very similar) to you but to that species of bird they would be able to tell each individual apart.
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