Recently I had a friend message me to ask me if it was me asking a question at a recorded event with audience questions that they were watching on YouTube (the camera only showed the stage, not audience members at the microphones).
They had absolutely no reason to think I would have been at that particular event.
And I told them, yup -- it was me asking that question a few years ago.
And there is nothing particularly distinctive about my voice. If anything, my voice is probably particularly generic. But it's just timbre, accent, and the unique "fingerprint" of my particular vocal personality.