ΔE 5.3, very close: most people won’t see a difference side by side. Nickel Azo Yellow is more saturated than Casandora Yellow. They are different kinds of paint: Citadel Casandora Yellow is a wash/shade and Golden Nickel Azo Yellow is an opaque base/layer paint, so they won’t behave the same on the model even where the colour is close.
Yes, for most jobs. Very close match (ΔE 5). Nickel Azo Yellow is more saturated than Casandora Yellow. They are different kinds of paint.
The same difference applies the other way round: Casandora Yellow is 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 Casandora Yellow on the colour wheel See Nickel Azo Yellow on the colour wheel
All matches: Casandora Yellow equivalents · Nickel Azo Yellow equivalents