ΔE 7.5, close: similar, with a visible difference side by side. Jungle Green is a little lighter than Olive Green.
Usually, if you are not matching paint already on the model. Close match (ΔE 8). Jungle Green is a little lighter than Olive Green.
The same difference applies the other way round: Olive Green is a little darker.
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 Jungle Green on the colour wheel
All matches: Olive Green equivalents · Jungle Green equivalents