Warplock Bronze vs Iridescent Bronze (Fine)

How close are they?

ΔE 15.8, loose: different enough that you should pick on purpose. Iridescent Bronze (Fine) is noticeably lighter, 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.

Can I use Iridescent Bronze (Fine) instead of Warplock Bronze?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 16). Iridescent Bronze (Fine) is noticeably lighter, more saturated, cooler than Warplock Bronze. They are different kinds of paint.

Can I use Warplock Bronze instead of Iridescent Bronze (Fine)?

The same difference applies the other way round: Warplock Bronze is noticeably darker, 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.