I don't think their respective powers affected their end goals and/or their "corruption". Light, given the geass (imagine the havoc), would have continued to judge the world and tried to become god. Lelouch, given the Note, would have continued to use its powers to his advantage in order to find his mother's murderer.
So yes, I think Light would still act like Light and Lelouch like Lelouch if the powers were switched. Any differences arise out of something more basic, independent of their powers.
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my unsolicited opinion lol
So yes, I think Light would still act like Light and Lelouch like Lelouch if the powers were switched. Any differences arise out of something more basic, independent of their powers.