I will probably have both, in 2 separate books(og kirito in the place of abridged kirito in sao abridged world, and abridged kirito in og kirito's place in og sao)
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A few scenes that come to mind:
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abridged kirito just sitting and watching the og moonlit black cats dieing instead of rescuing them when they first meet
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Og kirito calmaly explaining abridged asuna how to open and navigate her menu when they first meet, asuna getting the last hit on the boss and getting the midnight cloack, but giving it to kirito so she does not feel indebted to him
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Both kiritos getting weirded out by their sister once they get out of the game(the universal switch happening once the kiritos log in to sao's launch, so the sister from before sao and the one after are 2 diferent people)