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Lightsabers/hand to hand only

Battle takes place in the Octagon

If it's the end of OCW, then it's pretty reminiscent of their ROTS fight, if it's him as of the hypori fight, then Kenobi should solidly take him.

ROTS Kenobi. I think that unlike their final fight it'd come down to way of the blade. Kenobi would be pressed but I think he'd eventually find an opening and exploit it. I'd be an intense fight though.

I personally don't really see the need to differentiate between OCW Grievous and his other portrayals in a verses scenario.