is this alternate time line the same one desmond met charlie in while charlie was street performing?

we saw two versions of that scene. one in which charlie finished his song and it began to rain (presumably the original timeline) and then we saw a version where desmond interupted charlie to predict the rain...

is this evidence that desmond is now a temporal policeman along the lines of ms. hawking? maybe desmond flashing over during his extended deja vu experience is the catalyst of events that will eventually link these two worlds.

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