Build your lasagna in a 9-by-13-inch baking dish: Start with a layer of sauce, then top with a layer of noodles. Evenly spread half of the pumpkin filling, then half of the zucchini, over the noodles. Top with half of the cheese mixture and cover with some of the sauce. Repeat the layers, finishing with noodles and sauce; sprinkle with the remaining 1 cup mozzarella. Bake, uncovered, 35 to 40 minutes, or until bubbly. Let cool 15 minutes before slicing.