Brown Black vs Matt Black

How close are they?

ΔE 7.3, close: similar, with a visible difference side by side. Matt Black is a little darker, more muted than Brown Black.

Can I use Matt Black instead of Brown Black?

Usually, if you are not matching paint already on the model. Close match (ΔE 7). Matt Black is a little darker, more muted than Brown Black.

Can I use Brown Black instead of Matt Black?

The same difference applies the other way round: Brown Black is a little lighter, more saturated.

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.