ΔE 7.8, close: similar, with a visible difference side by side. Arcane Gold is a little darker, more muted than Iridescent Bright Gold (Fine). They are different kinds of paint: Golden Iridescent Bright Gold (Fine) is a pearl paint and Vallejo Arcane Gold is a metallic, 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 8). Arcane Gold is a little darker, more muted than Iridescent Bright Gold (Fine). They are different kinds of paint.
The same difference applies the other way round: Iridescent Bright Gold (Fine) is a little lighter, 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 Iridescent Bright Gold (Fine) on the colour wheel See Arcane Gold on the colour wheel
All matches: Iridescent Bright Gold (Fine) equivalents · Arcane Gold equivalents