ΔE 12.4, fair: the same colour family, but not a straight swap. Iridescent Bright Gold (Fine) is a little darker, warmer than Hexos Palesun. They are different kinds of paint: Citadel Hexos Palesun is an opaque base/layer paint and Golden Iridescent Bright Gold (Fine) is a pearl 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). Iridescent Bright Gold (Fine) is a little darker, warmer than Hexos Palesun. They are different kinds of paint.
The same difference applies the other way round: Hexos Palesun is a little lighter, cooler.
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 Hexos Palesun on the colour wheel See Iridescent Bright Gold (Fine) on the colour wheel
All matches: Hexos Palesun equivalents · Iridescent Bright Gold (Fine) equivalents