Didn't know S&W offered a CS9D but just saw ladder13's image so they clearly exist. S&W offered so many variations of 3rd Gens it's mind boggling.
My Catalogs show all of the CS9c carbon blue (only made a year or so circa 1999-2000) and the first year or two of CS9s stainless came with NON-ambi safety/decocker. Later production starting in 2000 CS9s stainless came with AMBI controls on both sides. If you're RH and want a flatter pistol I believe the NON-ambi are slightly more desirable.