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