ΔE 11.0, fair: the same colour family, but not a straight swap. Transparent Yellow Iron Oxide is a little lighter, more muted than Casandora Yellow. They are different kinds of paint: Citadel Casandora Yellow is a wash/shade and Golden Transparent Yellow Iron 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). Transparent Yellow Iron Oxide is a little lighter, more muted than Casandora Yellow. They are different kinds of paint.
The same difference applies the other way round: Casandora Yellow is a little darker, more saturated.
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 Casandora Yellow on the colour wheel See Transparent Yellow Iron Oxide on the colour wheel
All matches: Casandora Yellow equivalents · Transparent Yellow Iron Oxide equivalents