The dimensions of your whole vocal tract are unique to you, not just your vocal cords. Your voice’s sound is a result of your vocal cords, larynx, throat dimensions, mouth dimensions, sinus (and other head resonator-space) dimensions.
So when you’re not using your unique vocal cords to whisper, you’re still using your unique larynx, throat, mouth, sinuses etc. so a lot of the characteristics of your voice are preserved.
Also as others said, your speech patterns themselves (aka the way you talk – inflection patterns, speed/rhythm, vocabulary, etc) is also still there when you’re whispering, helping it sound “like you”.
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