Which is it? 18 or 23 minutes

Two identical pizzas, bought from the same store at the same time. Identical cooking instructions except for the time. 18 for one, 23 for the other. Is this why Lidl is so cheap?

Two identical pizzas, bought from the same store at the same time. Identical cooking instructions except for the time. 18 for one, 23 for the other. Is this why Lidl is so cheap?