ΔE 6.4, close: similar, with a visible difference side by side. Dark Yellow is a little lighter, warmer than RAL 7009 Hellgrau.
Usually, if you are not matching paint already on the model. Close match (ΔE 6). Dark Yellow is a little lighter, warmer than RAL 7009 Hellgrau.
The same difference applies the other way round: RAL 7009 Hellgrau is a little darker, 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 7009 Hellgrau on the colour wheel See Dark Yellow on the colour wheel
All matches: RAL 7009 Hellgrau equivalents · Dark Yellow equivalents