ΔE 10.1, fair: the same colour family, but not a straight swap. Green Beret is a little lighter, more saturated, warmer than Medium Drab.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 10). Green Beret is a little lighter, more saturated, warmer than Medium Drab.
The same difference applies the other way round: Medium Drab is a little darker, 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 Medium Drab on the colour wheel See Green Beret on the colour wheel
All matches: Medium Drab equivalents · Green Beret equivalents