Or,

Do some people THINK they have a better aural perception ?

I think it would be far more likely that a lack of electronic understanding would lead to the person imagining audible cable differences than someone with an understanding of the interaction between electronics and sound.

It's a bit like seeing the sun come up. If you didn't have an understanding of the factors involved you would find it very easy to convince yourself that the Earth is static and the Sun is moving relative to it. As soon as you have an understanding of the factors involved you dismiss the illusion.