The photo above shows the difference between a loaf of zucchini bread baked in a 9x5 pan versus in an 8x4 pan. The loaf on the left was baked in a 9x5 pan. The loaf on the right was baked in an 8x4 pan. So, while the recipe will work in a 9x5 pan, the loaf of zucchini bread will be wider and shorter. Also, the bread was finished baking about 5 minutes sooner.