ΔE 10.9, fair: the same colour family, but not a straight swap. Yellow Oxide is a little darker, more saturated than Aggaros Dunes. They are different kinds of paint: Citadel Aggaros Dunes is a one-coat contrast-style paint and Golden Yellow Oxide is an ink, glaze or transparent 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). Yellow Oxide is a little darker, more saturated than Aggaros Dunes. They are different kinds of paint.
The same difference applies the other way round: Aggaros Dunes is a little lighter, more muted.
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 Aggaros Dunes on the colour wheel See Yellow Oxide on the colour wheel
All matches: Aggaros Dunes equivalents · Yellow Oxide equivalents