ΔE 12.5, fair: the same colour family, but not a straight swap. Zamesi Desert is more saturated, cooler than Matt Orange. They are different kinds of paint: AMMO by Mig Matt Orange is an ink, glaze or transparent paint and Citadel Zamesi Desert is an opaque base/layer paint, so they won’t behave the same on the model even where the colour is close.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 12). Zamesi Desert is more saturated, cooler than Matt Orange. They are different kinds of paint.
The same difference applies the other way round: Matt Orange is more muted, 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 Matt Orange on the colour wheel See Zamesi Desert on the colour wheel
All matches: Matt Orange equivalents · Zamesi Desert equivalents