ΔE 18.6, loose: different enough that you should pick on purpose. Viridian Grim is noticeably darker, more muted, cooler than Death Korps Drab.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 19). Viridian Grim is noticeably darker, more muted, cooler than Death Korps Drab.
The same difference applies the other way round: Death Korps Drab is noticeably lighter, more saturated, warmer.
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 Death Korps Drab on the colour wheel See Viridian Grim on the colour wheel
All matches: Death Korps Drab equivalents · Viridian Grim equivalents