I have an untried pickled grapes recipe which I jotted down years ago (don't recall source). It calls for seedless black grapes, white vinegar, sugar, cinnamon stick, peppercorns, salt, and brown mustard seed. I have everything on hand except that I have yellow mustard seeds, not brown. I am not determined enough to try the recipe if I have to hunt around or mail-order the brown ones. I like prepared brown mustard, but not prepared yellow. How different will this recipe be if I use the yellow seeds?