Check Kohlerengines.com. The specs between the Courage V-twins and Command V-twins nearly the same. The Courage series single cylinder engines are a bit different though. I don't have personal experience with Gravely ZTRs, but they seem like nice compact, solidly built machines. Gravely has always been top-knotch IMO.
2012 Subaru Legacy 2.5i CVT, 2013 Dodge Grand Caravan SE (Babe magnet III)