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Difference between soy flour and soy protein powder?

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After seeing the rerun of the Good Eats episode in which he makes protein bars (http://www.foodnetwork.com/food/recip...). The recipe calls for soy protein powder.

At my local store, we have something called "soy protein powder," most of which is flavored and all of which is expensive. We also have Bob's Red Mill (a brand I use all the time) "soy flour," which is a fraction of the cost.

Are these the same thing? If not, can they be used interchangably?

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