ΔE 7.7, close: similar, with a visible difference side by side. Hammered Copper is a little lighter, more saturated than Iridescent Silver (Fine). They are different kinds of paint: Golden Iridescent Silver (Fine) is a pearl paint and Vallejo Hammered Copper 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). Hammered Copper is a little lighter, more saturated than Iridescent Silver (Fine). They are different kinds of paint.
The same difference applies the other way round: Iridescent Silver (Fine) is a little darker, 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 Iridescent Silver (Fine) on the colour wheel See Hammered Copper on the colour wheel
All matches: Iridescent Silver (Fine) equivalents · Hammered Copper equivalents