ΔE 9.1, close: similar, with a visible difference side by side. Mid Feldgrau is a little lighter, more muted, warmer than Russian Green Uniform.
Usually, if you are not matching paint already on the model. Close match (ΔE 9). Mid Feldgrau is a little lighter, more muted, warmer than Russian Green Uniform.
The same difference applies the other way round: Russian Green Uniform is a little darker, more saturated, 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 Russian Green Uniform on the colour wheel See Mid Feldgrau on the colour wheel
All matches: Russian Green Uniform equivalents · Mid Feldgrau equivalents