ΔE 5.6, very close: most people won’t see a difference side by side. Iridescent Copper (Fine) is more muted than Fresh Rust. They are different kinds of paint: Army Painter Fresh Rust is an opaque base/layer paint and Golden Iridescent Copper (Fine) is a pearl 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 6). Iridescent Copper (Fine) is more muted than Fresh Rust. They are different kinds of paint.
The same difference applies the other way round: Fresh Rust 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 Fresh Rust on the colour wheel See Iridescent Copper (Fine) on the colour wheel
All matches: Fresh Rust equivalents · Iridescent Copper (Fine) equivalents