ΔE 9.5, close: similar, with a visible difference side by side. IJA Olive Green is a little lighter, more muted than Olivegrove Green.
Usually, if you are not matching paint already on the model. Close match (ΔE 9). IJA Olive Green is a little lighter, more muted than Olivegrove Green.
The same difference applies the other way round: Olivegrove Green is a little darker, more saturated.
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 Olivegrove Green on the colour wheel See IJA Olive Green on the colour wheel
All matches: Olivegrove Green equivalents · IJA Olive Green equivalents