ΔE 7.0, close: similar, with a visible difference side by side. Iridescent Bright Gold (Fine) is more muted than Imp Yellow. They are different kinds of paint: Army Painter Imp Yellow 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.
Usually, if you are not matching paint already on the model. Close match (ΔE 7). Iridescent Bright Gold (Fine) is more muted than Imp Yellow. They are different kinds of paint.
The same difference applies the other way round: Imp Yellow is 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 Imp Yellow on the colour wheel See Iridescent Bright Gold (Fine) on the colour wheel
All matches: Imp Yellow equivalents · Iridescent Bright Gold (Fine) equivalents