Warm Skin vs Guilliman Flesh

How close are they?

ΔE 7.0, close: similar, with a visible difference side by side. Guilliman Flesh is a little lighter than Warm Skin. They are different kinds of paint: AMMO by Mig Warm Skin is an opaque base/layer paint and Citadel Guilliman Flesh is a one-coat contrast-style paint, so they won’t behave the same on the model even where the colour is close.

Can I use Guilliman Flesh instead of Warm Skin?

Usually, if you are not matching paint already on the model. Close match (ΔE 7). Guilliman Flesh is a little lighter than Warm Skin. They are different kinds of paint.

Can I use Warm Skin instead of Guilliman Flesh?

The same difference applies the other way round: Warm Skin 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.