ΔE 9.3, close: similar, with a visible difference side by side. Iridescent Bronze (Fine) is a little darker, more muted, cooler than True Brass. They are different kinds of paint: Army Painter True Brass is a metallic and Golden Iridescent Bronze (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 9). Iridescent Bronze (Fine) is a little darker, more muted, cooler than True Brass. They are different kinds of paint.
The same difference applies the other way round: True Brass is a little lighter, more saturated, warmer.
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 True Brass on the colour wheel See Iridescent Bronze (Fine) on the colour wheel
All matches: True Brass equivalents · Iridescent Bronze (Fine) equivalents