71.025 is a very close match to what was Dunkelgelb Nach Muster which was only used from February 1943 to the end of Operation Citadel (Kursk) in August. That colour was withdrawn due to feedback and compaints from the front and never entered the register. What became known as RAL 7028 was actually a beige colour.
As a Vehicle restorer with lots of German Vehicles I have to be absolutley correct on this and I have an aggreement with a German paint company who very kindly makes the German RAL paints or me from their archive and the official chipsets of the period.
When AK brought out their "Real Color" sets which are meant to be matches to chipsets I tested them against the paints which are made and matched for me.
Dunkelgelb Nach Muster
RAL 7028
August 1943- May 1944
May- December 1944
December 1944 - End of hostilities 1943 with RAL 6003 as base coat
THere were shade variants from this as each factory had their own pigment formulae, but they were never more than 10% each way from the chipsets on the left. A letter was sent out thanking the paint firms for this high standard even with the constant disruptions and shortages caused by the Allied bombing effort and can be read in the Freiburg Archives.
What you can do is to message Vallejo on FB who have my samples are should be developing these into the model air range and tell them to get a move on!
These shades, strangely enough are not far out from the Afrika Korps paints and one of my recovered motocycles sports a manufacurer date of August 1944 and has a base coat of RAL 8000, one of the Afrika Korps colours!
Nothing is nailed down when it comes to usage, but the AK paints are not within the actual tolorences and I think that they have been using stuff that has been outside for 70 odd years which is prone to sun bleaching etc as their references. Also, their paints aren't as good as quality as Vallejo's model air, apart from their Xtreme metals which although don't like handling or masking are fantastic!