Rubber Black vs Magnolia Brown

How close are they?

ΔE 6.2, close: similar, with a visible difference side by side. Magnolia Brown is a little lighter than Rubber Black.

Can I use Magnolia Brown instead of Rubber Black?

Usually, if you are not matching paint already on the model. Close match (ΔE 6). Magnolia Brown is a little lighter than Rubber Black.

Can I use Rubber Black instead of Magnolia Brown?

The same difference applies the other way round: Rubber Black 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.