Okay so the thing is 'you' doesn't exist, the idea of a self is an illusion. There is no difference between something and it's exact copy. And, the you that is now is different from the you you were 5 seconds ago, is different from the you 5 years ago. Small, nearly unnoticeable changes, but changes nonetheless, resulting in separate entities, the only difference between the two is simply how noticeable that fact is. 'You' only exist in the present, every past slice only something you believe was you. Not to mention that we are only chemical and electrical processi in a meat computer, we are just a sum of dissolute parts that manage to pretend to be something you call 'you'.
The question fundamentally doesn't work, because there is no 'original', no 'clone', and every 'you' but the present you is dead and not you and never was you, and you don't even exist as an independent concept and never did, so both the 'original' and the 'clone' are just as much you as anything else is, which is, not, or rather, only in an illusory sense.
Also, it's kinda weird framing it as original vs clone, because it's two halves of your brain each in a new body (or even if one had the original body, original is irrelevant and the new body isn't a 'clone', the brain is still original in both and that's the only part that matters). Both have equal claim to the identity of 'you'.
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Or there's another way to think about it(/a better way to put the same thing?). Identical twins, that started as a single cell. Which is the original? It's a silly question. Neither, and both. The original cell is gone and no longer exists in any state that could be considered the same, so neither. But also, both are continuous from that original cell, so if we consider 'you' as the sum of all your history, they both contain the original as their history, so both are the original.
But are they really?
The scenario with the twins, and the original scenario, are both functionally identical to the following:
There is a person. They enter a magical vortex, and which spits out two of them, exactly as the person was when they entered. They both have all the memories of the person who entered the vortex, a continuous stream of thought from the moment they entered the vortex to the moment they were spat out, it was as though time had passed normally. They each have equal claim to being the original, the same as you would have claim to being the person you were five seconds ago. So, you would think they are both the original, right? We can represent that mathematically. Let's call the two X and Y, and the original, O. X=O, and Y=O.
Fast forward five years. X has won the lottery, and has been living a glamourous, bright life, has found love, started a family, the works. The other, Y, fell into deep poverty and crime. They're scarred physically, and thin. They have grown bitter and cynical and tired, and hate the world. Are they the same person? I wouldn't say so. They have lived fundamentally different lives, have different histories, different personalities, are in different situations. By all practical measures, they are different people. So, X≠Y. But wait a moment, there's a problem. If we use our last equations, we can replace X and Y with O, since they are both the original. But that gives us O≠O, or, the original is not the original. So, that means our assumption that X=O and Y=O must have been wrong. Neither are the original. But why? There was nothing to distinguish the original from the two- until time passed. Perhaps, it's not that X=O and Y=O was wrong, maybe the mistake is in calling the people they are now the same as they were then? If we say that after the passage of time, X is now X', and Y is now Y', and it's X'≠Y', then it works.
Well, where does one draw the line? How much time has to pass before there is a change, before we can no longer call someone the same person as they were before? Before X turns into X'? That's a trick question, because people are changing all the time. Our brains are always operating, taking in new information, processing old information, variables like chemicals are in flux, changing moods, resulting in differences between the person from one moment to the next. In a very real way, we are never the exact same person as we were the moment before. Usually the changes are very slight, small, practically ignorable. But they can build up to be very significant. Every moment you change, from O, to O', to O'', etc, and none of these yous are equivalent.
You, are not the you that you were, and in any hypothetical scenario where you are considering things happening and which is 'you' or not, the answer will always be no, because you are always changing, and after any change, you are no longer the you that you were.
