Heat oven to 425°F. Toss eggplant with 2 tablespoons oil and 1/2 teaspoon salt on rimmed sheet. Roast 25 to 30 minutes, turning once, until tender and browned.
Boil ziti 2 minutes less than package time; drain. Heat remaining oil in saucepan; stir garlic 30 seconds. Add tomatoes, sauce, basil, remaining salt, and pepper; simmer 10 minutes.
Transfer pasta, eggplant, and sauce to shallow containers. Refrigerate within 2 hours; chill fully before assembly.
Fold ziti and eggplant with sauce, ricotta, and half mozzarella. Divide between two 8-inch-square metal pans; top with remaining mozzarella and Parmesan.
Before final bake, tightly cover pans with foil and second protective wrap. Label; freeze up to 2 months.
Thaw pan in refrigerator 24 hours. Remove outer wrap; bake covered at 375°F for 30 minutes, then uncovered 15 to 20 minutes to 165°F in center.
Rest 10 minutes; serve 4 portions per pan. Reheat refrigerated cooked portions covered at 350°F for 20 to 25 minutes to 165°F.