Deep Brown vs Skrag Brown

How close are they?

ΔE 7.9, close: similar, with a visible difference side by side. Skrag Brown is more saturated, warmer than Deep Brown.

Can I use Skrag Brown instead of Deep Brown?

Usually, if you are not matching paint already on the model. Close match (ΔE 8). Skrag Brown is more saturated, warmer than Deep Brown.

Can I use Deep Brown instead of Skrag Brown?

The same difference applies the other way round: Deep Brown is more muted, 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.