ΔE 6.4, close: similar, with a visible difference side by side. Middle Stone is more saturated than Wasteland Clay.
Usually, if you are not matching paint already on the model. Close match (ΔE 6). Middle Stone is more saturated than Wasteland Clay.
The same difference applies the other way round: Wasteland Clay is more muted.
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 Middle Stone on the colour wheel
All matches: Wasteland Clay equivalents · Middle Stone equivalents