Nickel Azo Yellow vs Leather Brown

How close are they?

ΔE 12.6, fair: the same colour family, but not a straight swap. Leather Brown is a little darker, warmer than Nickel Azo Yellow.

Can I use Leather Brown instead of Nickel Azo Yellow?

Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 13). Leather Brown is a little darker, warmer than Nickel Azo Yellow.

Can I use Nickel Azo Yellow instead of Leather Brown?

The same difference applies the other way round: Nickel Azo Yellow is a little lighter, 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.