ΔE 11.9, fair: the same colour family, but not a straight swap. Goblin Green is a little lighter, more muted, cooler than Olive Green.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 12). Goblin Green is a little lighter, more muted, cooler than Olive Green.
The same difference applies the other way round: Olive Green is a little darker, more saturated, 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 Olive Green on the colour wheel See Goblin Green on the colour wheel
All matches: Olive Green equivalents · Goblin Green equivalents