ΔE 16.9, loose: different enough that you should pick on purpose. Forest Green is a little darker, cooler than Death Korps Drab.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 17). Forest Green is a little darker, cooler than Death Korps Drab.
The same difference applies the other way round: Death Korps Drab is a little lighter, 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 Forest Green on the colour wheel
All matches: Death Korps Drab equivalents · Forest Green equivalents