I think that the proper description of the buckskin interior is light cream.
Yes, to begin with...... Actually having recoloured the seat with an unfaded sample it's greyish/beige/stone and not really cream. If you've noticed no one seems to have managed to replace the leather with anything that looks remotely like the original.
The colours in the P6 are plain weird - try and match the mortlake carpet as well - that shade of grey/brown/yellow doesn't exist anywhere else, it's just impossible.