Given that Corn Meal Gluten is the second ingredient listed in the C/D food, it will have a relatively high content. Take a piece of both types of food and put them in water to see which on "puffs up" first. I will bet you that the C/D kibble is the first one

It may take a little while to notice the different with removing the corn, but it has saved me A LOT of money in vet bills by removing it from his diet.

(BTW, Spunky turned out to be a boy not a girl )