ΔE 14.9, fair: the same colour family, but not a straight swap. Death Korps Drab is noticeably lighter, more saturated than Field Grey Base #1 (Green uniform).
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 15). Death Korps Drab is noticeably lighter, more saturated than Field Grey Base #1 (Green uniform).
The same difference applies the other way round: Field Grey Base #1 (Green uniform) is noticeably darker, more muted.
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 Field Grey Base #1 (Green uniform) on the colour wheel See Death Korps Drab on the colour wheel
All matches: Field Grey Base #1 (Green uniform) equivalents · Death Korps Drab equivalents