ΔE 7.8, close: similar, with a visible difference side by side. Intermediate Green is a little lighter, cooler than Olivgrün.
Usually, if you are not matching paint already on the model. Close match (ΔE 8). Intermediate Green is a little lighter, cooler than Olivgrün.
The same difference applies the other way round: Olivgrün is a little darker, 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 Olivgrün on the colour wheel See Intermediate Green on the colour wheel
All matches: Olivgrün equivalents · Intermediate Green equivalents