I've made KAF White Bread 101 innumerable times with KAF all purpose flour and with KAF bread flour and the results are virtually the same, except possibly a slightly higher rise with the bread flour, but they do seem interchangeable. I think the difference is barely discernible. As for the keeping qualities others have mentioned, the small amount of potato flour in White Bread 101 helps with the shelf life of the bread, as does using milk or potato water for the liquid in the bread. Older bread bakers knew this.

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