The "G" probably isn't relating to your interior color. At the very top should be the word "Ausstattung" and in my case the number is 214.
The first digit is type; 0= cloth, 1=MB Tex, 2=leather.
Use the Pagoda website and see if the number matches what you have found already:
Pagoda SL Group Technical Manual :: DataCard / UpholsteryCodes
In my case you will see that #214 shows the seat leather color as "rust red 1099" and the carpet color as "rust red 6508" as a guide.
Not all colors carried over between the W113 to the W111 but many did. Let me know if you run into any problems.