ΔE 15.0, fair: the same colour family, but not a straight swap. Pine Green is noticeably darker, warmer than Grass Green.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 15). Pine Green is noticeably darker, warmer than Grass Green.
The same difference applies the other way round: Grass Green is noticeably lighter, 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 Pine Green on the colour wheel
All matches: Grass Green equivalents · Pine Green equivalents