ΔE 8.3, close: similar, with a visible difference side by side. Aggaros Dunes is a little darker than Washable Sand. They are different kinds of paint: AMMO by Mig Washable Sand is an opaque base/layer 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.
Usually, if you are not matching paint already on the model. Close match (ΔE 8). Aggaros Dunes is a little darker than Washable Sand. They are different kinds of paint.
The same difference applies the other way round: Washable Sand 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 Washable Sand on the colour wheel See Aggaros Dunes on the colour wheel
All matches: Washable Sand equivalents · Aggaros Dunes equivalents