ΔE 6.1, close: similar, with a visible difference side by side. IJN Medium Grey is a little darker, more muted than Desert Olive Green.
Usually, if you are not matching paint already on the model. Close match (ΔE 6). IJN Medium Grey is a little darker, more muted than Desert Olive Green.
The same difference applies the other way round: Desert Olive Green is a little lighter, 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 Desert Olive Green on the colour wheel See IJN Medium Grey on the colour wheel
All matches: Desert Olive Green equivalents · IJN Medium Grey equivalents