ΔE 8.2, close: similar, with a visible difference side by side. IJN Gray Green Nakajima is a little lighter, cooler than Light Feldgrau.
Usually, if you are not matching paint already on the model. Close match (ΔE 8). IJN Gray Green Nakajima is a little lighter, cooler than Light Feldgrau.
The same difference applies the other way round: Light Feldgrau 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 Light Feldgrau on the colour wheel See IJN Gray Green Nakajima on the colour wheel
All matches: Light Feldgrau equivalents · IJN Gray Green Nakajima equivalents