Iridescent Copper Light (Fine) vs Light Brown

How close are they?

ΔE 6.8, close: similar, with a visible difference side by side. Light Brown is a little lighter than Iridescent Copper Light (Fine). They are different kinds of paint: Golden Iridescent Copper Light (Fine) is a pearl paint and Vallejo Light Brown is an opaque base/layer paint, so they won’t behave the same on the model even where the colour is close.

Can I use Light Brown instead of Iridescent Copper Light (Fine)?

Usually, if you are not matching paint already on the model. Close match (ΔE 7). Light Brown is a little lighter than Iridescent Copper Light (Fine). They are different kinds of paint.

Can I use Iridescent Copper Light (Fine) instead of Light Brown?

The same difference applies the other way round: Iridescent Copper Light (Fine) is a little darker.

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.