ΔE 12.1, fair: the same colour family, but not a straight swap. Transparent Yellow Iron Oxide is a little lighter, more muted than Nazdreg Yellow. They are different kinds of paint: Citadel Nazdreg Yellow is a one-coat contrast-style paint 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 12). Transparent Yellow Iron Oxide is a little lighter, more muted than Nazdreg Yellow. They are different kinds of paint.
The same difference applies the other way round: Nazdreg 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 Nazdreg Yellow on the colour wheel See Transparent Yellow Iron Oxide on the colour wheel
All matches: Nazdreg Yellow equivalents · Transparent Yellow Iron Oxide equivalents