I am sorry, I do not have that information. You may try Fein Design here on Houzz who was the contractor who built the house to see if they have that info.
We actually didn't build this house either, but the roof is a mill finish. Don't know the exact color. If I were you, I would contact a roofing company and start asking questions on what metal products they can get, and colors available.
Deep River Partners
Fein Design