There is no you to begin with; That is, if we think of the you as some kind of constant manifestation outside of a subjective cognitive phenomenon. You or "I" never is and never was.
- mind is more than mere neurons, there's the wholes issue of brain chemistry, genetics (I could be deaf and blind), notwithstanding that I am made of more than mind, I have a body, CNS etc that differ from yours.
You'd be very close, but still lacking 'indescernability' in that you could not inhabit the same spatio-temporal location as I do. You don't get to the magic 'a=a' because you would be spatially discernable from me.
You're already me, in the sense of my existence (including these words here) being your perception. And there's never actually anything outside 'present perception' -- as the notion that there is something outside of/other than present perception, is present perception.