ΔE 10.1, fair: the same colour family, but not a straight swap. Midnight Olive is more muted than Forest Green (FS34079).
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 10). Midnight Olive is more muted than Forest Green (FS34079).
The same difference applies the other way round: Forest Green (FS34079) is more saturated.
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 Forest Green (FS34079) on the colour wheel See Midnight Olive on the colour wheel
All matches: Forest Green (FS34079) equivalents · Midnight Olive equivalents