Hi there! You need different amounts of doughs for the 13" and the 9" pan. If you want to use a 13" pain de mie pan with this recipe, you could increase all the ingredients by 50%, except the yeast, for which you would just use the amount in the original recipe. So, you don't need two pans, but if you are just going to have one pan, then you want to make sure your recipe is correctly sized for that pan. Happy baking! Jocelyn@KAF

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