ΔE 6.1, close: similar, with a visible difference side by side. Dark DAK Sand is a little darker than Nº6 Earth Yellow (FS30257).
Usually, if you are not matching paint already on the model. Close match (ΔE 6). Dark DAK Sand is a little darker than Nº6 Earth Yellow (FS30257).
The same difference applies the other way round: Nº6 Earth Yellow (FS30257) is a little lighter.
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 Nº6 Earth Yellow (FS30257) on the colour wheel See Dark DAK Sand on the colour wheel
All matches: Nº6 Earth Yellow (FS30257) equivalents · Dark DAK Sand equivalents