If you have two different brands but both sell a color called weatherwood, is the color the exact same between the two? I realize if comparing same color in older vs newer shingles there could be some variation from the elements, but if you were replacing a partial roof and could get a better deal on one brand vs another, AND the shingles would not be spliced together, would the same color match well enough regardless of brand or must you get the EXACT same brand model shingles (if you can find them).