Hi Mary, The two flours you mentioned, the King Arthur All-Purpose Flour and the Gluten-Free Measure for Measure Flour, are different in a few ways but most importantly, the Measure for Measure is gluten-free. The good news is that you can use the two interchangeably in most cases. If you have a regular (gluten-full) recipe, you can substitute our Measure for Measure Flour to make it gluten-free. (The only cases where you'll need to provide a little more care is when baking gluten-free recipes with yeast.) It sounds like in this case you're hoping to do the opposite and make this gluten-free recipe with our all-purpose flour, in which case you can use this recipe for Lemon Bliss Cake. We hope that helps! Kye@KAF

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