I haven't used their paint line. Do you have a color already chosen for your project? I bet we can come close to one similar if you post your selection(s). You can also check with your local paint store (BM or SW) and see if they can match it. Many other dealers have the paint formulas in their systems.
PS: What color are you looking at from RH?
~Like sands through the hourglass ~So are the days of our lives