ΔE 8.0, close: similar, with a visible difference side by side. Bony Matter is a little darker than US Desert Tan. They are different kinds of paint: AMMO by Mig US Desert Tan is an opaque base/layer paint and Army Painter Bony Matter is a one-coat contrast-style paint, so they won’t behave the same on the model even where the colour is close.
Usually, if you are not matching paint already on the model. Close match (ΔE 8). Bony Matter is a little darker than US Desert Tan. They are different kinds of paint.
The same difference applies the other way round: US Desert Tan is a little lighter.
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 US Desert Tan on the colour wheel See Bony Matter on the colour wheel
All matches: US Desert Tan equivalents · Bony Matter equivalents