Mmm Kabuto was still a pretty good shinobi back then but honestly, Sasuke was portrayed as a power house in comparison. Kabuto already admit that close quarters was his weak area, so fighting a competent Uchiha with kenjutsu training and lightning release is almost suicide. Lightning style comes equipped with a numbing effect, meaning that if hit, the opponent is incapable of moving in almost all scenarios. Not only that, but it makes his sword almost unable to be blocked as well - meaning Kabuto
has to dodge it if he doesn't want to get sliced.[
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] CQC is a huge threat for Kabuto since Sasuke has been known for his speed in Part 2, and should easily be able to close the gap between them.
Honestly there aren't very many good scenarios for Kabuto here. Sasuke has the curse mark, Fire Style techniques, mid-long range Lightning Style techniques, Genjutsu.. I don't think Kabuto's has good odds here.