Retributor Armour vs Gold Brown

How close are they?

ΔE 16.6, loose: different enough that you should pick on purpose. Gold Brown is a little darker, more muted, warmer than Retributor Armour.

Can I use Gold Brown instead of Retributor Armour?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 17). Gold Brown is a little darker, more muted, warmer than Retributor Armour.

Can I use Retributor Armour instead of Gold Brown?

The same difference applies the other way round: Retributor Armour is a little lighter, more saturated, cooler.

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.