Banshee Brown vs Undead Flesh

How close are they?

ΔE 9.7, close: similar, with a visible difference side by side. Undead Flesh is more saturated, cooler than Banshee Brown.

Can I use Undead Flesh instead of Banshee Brown?

Usually, if you are not matching paint already on the model. Close match (ΔE 10). Undead Flesh is more saturated, cooler than Banshee Brown.

Can I use Banshee Brown instead of Undead Flesh?

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

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.