I don't know much as I'm new here but looking at Kohler's website the 23 HP Command vertical shaft looks to have been dropped from the lineup, probably the reason why the newer CC's of that model have the 23 HP Courage instead. Only vertical shaft 23 HP Command still in the Kohler lineup is a Command Pro.
A quick look at specs show a nearly apples-to-apples comparison in design as far as the twins go, but ratings actually show the Courage produces 4.7 ft/lbs more torque than the Command Pro in the 23 HP versions. It might not be an issue to get upset over, the Courage doesn't look to be a cheaper engine, and on single cylinder versions it has twin cam advantage over the Commands.
That was my small amount of internet research, it would be interesting to see what CC says.
-Fordlords-