Hi,
I´m not very sure this will help, but check this site: “www.shipcamouflage.com”. Click on the “S&S Paint chips sets” icon and then on “Kriegsmarine set#2”. There´s a “Deckfarbebraun” that may be the one you´re looking for. You´ll probable need to buy the set to have an accurate pattern to which to match any paint.
Best of lucks.
GUIDO.
PS: There used to be a book in German, something like “Anstriche und Tarnanstriche der Kriesgmarine” (my German is veeery poor, so don´t trust my spelling) that had the same colour charts as the website, plus a list of colours without samples and a few colour photos. Perhaps you can still find it on Amazon or Bookfinder.