ΔE 6.2, close: similar, with a visible difference side by side. Bootstrap Brown is more saturated, cooler than Waffen Brown Grey.
Usually, if you are not matching paint already on the model. Close match (ΔE 6). Bootstrap Brown is more saturated, cooler than Waffen Brown Grey.
The same difference applies the other way round: Waffen Brown Grey is more muted, 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 Waffen Brown Grey on the colour wheel See Bootstrap Brown on the colour wheel
All matches: Waffen Brown Grey equivalents · Bootstrap Brown equivalents