ΔE 7.8, close: similar, with a visible difference side by side. Dark Imperial Khaki is more saturated, warmer than WWI German Fokker Grey.
Usually, if you are not matching paint already on the model. Close match (ΔE 8). Dark Imperial Khaki is more saturated, warmer than WWI German Fokker Grey.
The same difference applies the other way round: WWI German Fokker Grey is more muted, 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 WWI German Fokker Grey on the colour wheel See Dark Imperial Khaki on the colour wheel
All matches: WWI German Fokker Grey equivalents · Dark Imperial Khaki equivalents