My '84 Westy is also Merian Brown/ Toscana beige.
When I bought the van the PO had 2 touch-up cartridges.
One was Merian brown, the other was Timor Beige.
I can tell you it most definately is not Timor beige !!       Toscana beige
it is.
Wish I could remember the code number as I once had it.   I was unable to
order paint of this colour from the local VW dealer.

If you find some, I want some too !

cheers,  Steve Cotsford