ΔE 8.3, close: similar, with a visible difference side by side. Desert Yellow is a little darker, more saturated, warmer than RAL 7028 Dunkelgelb (Initial).
Usually, if you are not matching paint already on the model. Close match (ΔE 8). Desert Yellow is a little darker, more saturated, warmer than RAL 7028 Dunkelgelb (Initial).
The same difference applies the other way round: RAL 7028 Dunkelgelb (Initial) is a little lighter, more muted, cooler.
ΔE is the colour difference between our two swatch estimates: under about 6 is close, over about 15 is loose. Real paints also differ in finish, coverage and how they thin, so test before you commit.
See RAL 7028 Dunkelgelb (Initial) on the colour wheel See Desert Yellow on the colour wheel
All matches: RAL 7028 Dunkelgelb (Initial) equivalents · Desert Yellow equivalents