Starship Sludge Bay vs Leather Brown

How close are they?

ΔE 9.5, close: similar, with a visible difference side by side. Leather Brown is a little lighter, warmer than Starship Sludge Bay.

Can I use Leather Brown instead of Starship Sludge Bay?

Usually, if you are not matching paint already on the model. Close match (ΔE 10). Leather Brown is a little lighter, warmer than Starship Sludge Bay.

Can I use Starship Sludge Bay instead of Leather Brown?

The same difference applies the other way round: Starship Sludge Bay is a little darker, 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.