*I say for the most part because I'm factoring in those parts of me that would be formed through nurture rather than nature.
I was just having this discussion with someone recently - what exactly would you say constitutes the "nature" part of you? Seems to me like all the things that make you you - your personality, beliefs, attitudes, views, memories, feelings... Seems like those are all a matter of nurture.
Frankly, the only things that seem to be a matter of nature are the physical things. The way you look, the way your body is structured, the color of your eyes. Maybe I'm mistaken? Maybe certain things about your mind are natural, based on brain chemistry, but how much do those really influence your idea of "you"? Only if they're really severe, a la schizophrenia or something.
More to the point of the question, though, I think the thing that you're really asking about is whether the subjective experience you're having right now would still exist. Not really whether "I" would exist (that is, your current idea of you), but whether your "I-ness" would exist (you-ness in general). I think that would exist, but in the same sense that I think it always exists.
If this "you" (your ego) didn't exist, the particular "you" that existed instead
would be related to your current idea of "you", but only to pretty much the same extent that your current idea of "you" is related to any other person. You share the property of having subjective experiences, but beyond that...
The part of "you" that is just the ability to have subjective experiences (soul?) would still exist, but to say anything about the form that those subjective experiences would take, or how they would relate to the ones you're having now, seems pretty much pointless. The alternate "you" may well be some other girl in some other country, but it might also be a cat, or a bug, or some sort of conscious carpet.