The interior colours on the P38 with leather are standard, unless you ordered say Pink...and paid a fortune for it !! There are no shade variations on the basic colours. However the piping came in various colours to compliment the body colour.
To name a few, off the top of my head, there is Lightstone (Cream/Beige), Tan (Light Brown), Grey, Black & Blue.
No doubt someone will be along soon with any that I may have missed :behindsofa:
The part numbers have a suffix which denotes the colour, in the case of Lightstone, its "SMK"