Guilliman Flesh vs Shadow Flesh

How close are they?

ΔE 11.8, fair: the same colour family, but not a straight swap. Shadow Flesh is a little darker, more saturated, cooler than Guilliman Flesh.

Can I use Shadow Flesh instead of Guilliman Flesh?

Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 12). Shadow Flesh is a little darker, more saturated, cooler than Guilliman Flesh.

Can I use Guilliman Flesh instead of Shadow Flesh?

The same difference applies the other way round: Guilliman Flesh is a little lighter, 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.