What is the Porsche description of the interior color code "HQ"? it is grey, but what is the specific name of it?

 

I may have incomplete material here, but I have no record of any 2-character interior codes at all.
I have a number of grey leathers that appear throughout the model line:
Grey-Green 4JX or 5JX
Grey-Biege 4FK or 6FL
Silver-Grey 3VC