ΔE 13.2, fair: the same colour family, but not a straight swap. Khaki Green is more saturated, warmer than Dark Reaper.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 13). Khaki Green is more saturated, warmer than Dark Reaper.
The same difference applies the other way round: Dark Reaper is 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 Dark Reaper on the colour wheel See Khaki Green on the colour wheel
All matches: Dark Reaper equivalents · Khaki Green equivalents