Why is the HoE muted so much more vibrant than the other mills? Is this a trick of the light or do they really stand apart that much?

While we're at it, It looks to my highly trained internet eye that the Strathmore 13oz muted for Clanranald is ever so slightly darker than the Marton Mills 16oz of the same. Again, are my eyes playing tricks on me or have I deduced correctly?

Anyone able to post and identify more Clanranald kilts would gain my gratitude.