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