ΔE 6.6, close: similar, with a visible difference side by side. Medium Olive is a little darker, warmer than Mid Feldgrau.
Usually, if you are not matching paint already on the model. Close match (ΔE 7). Medium Olive is a little darker, warmer than Mid Feldgrau.
The same difference applies the other way round: Mid Feldgrau is a little lighter, cooler.
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 Mid Feldgrau on the colour wheel See Medium Olive on the colour wheel
All matches: Mid Feldgrau equivalents · Medium Olive equivalents