ΔE 11.7, fair: the same colour family, but not a straight swap. Dark Reaper is a little lighter, cooler than Dark Drab.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 12). Dark Reaper is a little lighter, cooler than Dark Drab.
The same difference applies the other way round: Dark Drab is a little darker, 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 Dark Drab on the colour wheel See Dark Reaper on the colour wheel
All matches: Dark Drab equivalents · Dark Reaper equivalents