ΔE 6.7, close: similar, with a visible difference side by side. Dark Boot Brown is a little lighter, warmer than German Field Grey.
Usually, if you are not matching paint already on the model. Close match (ΔE 7). Dark Boot Brown is a little lighter, warmer than German Field Grey.
The same difference applies the other way round: German Field Grey is a little darker, 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 German Field Grey on the colour wheel See Dark Boot Brown on the colour wheel
All matches: German Field Grey equivalents · Dark Boot Brown equivalents