ΔE 9.8, close: similar, with a visible difference side by side. Van Dyke Brown Hue is a little darker, more saturated, warmer than Dark Soviet Khaki.
Usually, if you are not matching paint already on the model. Close match (ΔE 10). Van Dyke Brown Hue is a little darker, more saturated, warmer than Dark Soviet Khaki.
The same difference applies the other way round: Dark Soviet Khaki 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 Dark Soviet Khaki on the colour wheel See Van Dyke Brown Hue on the colour wheel
All matches: Dark Soviet Khaki equivalents · Van Dyke Brown Hue equivalents