I must say there are an awful lot of Heavy Cavalry in the Iron Dukes ORBAT. Not so much in the Confederate ORBAT. Who will win? The Duke of Boots was a great user of the 'Reverse Slope Defence and using Line Formation.
It depends on the tactics of the Commanders; how they position there troops, frontal or flank attack, using Artillery to cover the advance of the Cavalry. I believe it would be a closely fought Battle.