ΔE 9.8, close: similar, with a visible difference side by side. Gun Corps Brown is a little darker, cooler than Basilisk Brown.
Usually, if you are not matching paint already on the model. Close match (ΔE 10). Gun Corps Brown is a little darker, cooler than Basilisk Brown.
The same difference applies the other way round: Basilisk Brown is a little lighter, 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 Basilisk Brown on the colour wheel See Gun Corps Brown on the colour wheel
All matches: Basilisk Brown equivalents · Gun Corps Brown equivalents