I think their colour list was intended to match the appropriate RLM shades. The 117 US light green is likely their suggested RLM 02 equivalent.
The above link is just an exmple, but for various reasons the images are not intended as an exact match! As you can see though, the 74/75 is basically a grey on grey scheme.
Don't let the names fool you, many paint companys will not directly label their bottles as RLM so that they can be used on other non-Luftwaffe subjects. Conversely, just becasue a paint bottle has RLM ## on it, doesn't necessarily mean it's an exact match either.
regards,
Jack