ΔE 12.8, fair: the same colour family, but not a straight swap. Bright Green is noticeably lighter, warmer than Muddy Olive.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 13). Bright Green is noticeably lighter, warmer than Muddy Olive.
The same difference applies the other way round: Muddy Olive is noticeably darker, 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 Muddy Olive on the colour wheel See Bright Green on the colour wheel
All matches: Muddy Olive equivalents · Bright Green equivalents