ΔE 10.7, fair: the same colour family, but not a straight swap. Iridescent Bronze (Fine) is more saturated, cooler than Warplock Bronze. They are different kinds of paint: Citadel Warplock Bronze 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.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 11). Iridescent Bronze (Fine) is more saturated, cooler than Warplock Bronze. They are different kinds of paint.
The same difference applies the other way round: Warplock Bronze is more muted, 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 Warplock Bronze on the colour wheel See Iridescent Bronze (Fine) on the colour wheel
All matches: Warplock Bronze equivalents · Iridescent Bronze (Fine) equivalents