ΔE 13.8, fair: the same colour family, but not a straight swap. Splinter Green is more muted, warmer than Grass Green.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 14). Splinter Green is more muted, warmer than Grass Green.
The same difference applies the other way round: Grass Green is more saturated, 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 Splinter Green on the colour wheel
All matches: Grass Green equivalents · Splinter Green equivalents