Blackert Brown vs Forest Skin

How close are they?

ΔE 9.1, close: similar, with a visible difference side by side. Forest Skin is a little darker than Blackert Brown.

Can I use Forest Skin instead of Blackert Brown?

Usually, if you are not matching paint already on the model. Close match (ΔE 9). Forest Skin is a little darker than Blackert Brown.

Can I use Blackert Brown instead of Forest Skin?

The same difference applies the other way round: Blackert Brown is a little lighter.

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.