Although it closely resembles the Rayquaza coin released in 2008, there are subtle differences in coloration, so I believe it is likely a different version.
左が少し青みがかって見える/The left one appears to have a slightly bluish tint.裏面に差はない/There is no difference on the back side.左が2008年のコイン/The one on the left is the 2008 coin.