ΔE 11.3, fair: the same colour family, but not a straight swap. Aggaros Dunes is more muted, cooler than Matt Orange. They are different kinds of paint: AMMO by Mig Matt Orange is an ink, glaze or transparent paint and Citadel Aggaros Dunes is a one-coat contrast-style 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 11). Aggaros Dunes is more muted, cooler than Matt Orange. They are different kinds of paint.
The same difference applies the other way round: Matt Orange is more saturated, 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 Aggaros Dunes on the colour wheel
All matches: Matt Orange equivalents · Aggaros Dunes equivalents