ΔE 12.5, fair: the same colour family, but not a straight swap. Bright Green is a little lighter, cooler than Drab Green.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 13). Bright Green is a little lighter, cooler than Drab Green.
The same difference applies the other way round: Drab Green 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 Drab Green on the colour wheel See Bright Green on the colour wheel
All matches: Drab Green equivalents · Bright Green equivalents