The more familiar you are with his voice the less similar it would sound. It’s like how siblings look more similar to strangers.

Well remember that how your voice sounds to you isn’t what other people hear.

But I’m the guy who blurts out how the voice actor for the gate guard played the brother in that movie with that guy. And I can hear what he’s complaining about. There’s a lot of elements of his voice and the tempo is pretty close.

)usually it’s the tempo and certain phonemes that give people away to me when they are doing a different accent)