ΔE 8.6, close: similar, with a visible difference side by side. Iridescent Copper Light (Coarse) is a little lighter than Desert Skin. They are different kinds of paint: Army Painter Desert Skin is an opaque base/layer paint and Golden Iridescent Copper Light (Coarse) is a pearl 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 9). Iridescent Copper Light (Coarse) is a little lighter than Desert Skin. They are different kinds of paint.
The same difference applies the other way round: Desert Skin is a little darker.
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 Desert Skin on the colour wheel See Iridescent Copper Light (Coarse) on the colour wheel
All matches: Desert Skin equivalents · Iridescent Copper Light (Coarse) equivalents