ΔE 14.2, fair: the same colour family, but not a straight swap. Medium Olive is a little lighter, more muted, warmer than Black Forest Green.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 14). Medium Olive is a little lighter, more muted, warmer than Black Forest Green.
The same difference applies the other way round: Black Forest Green is a little darker, more saturated, 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 Black Forest Green on the colour wheel See Medium Olive on the colour wheel
All matches: Black Forest Green equivalents · Medium Olive equivalents