Vampiric Flesh vs Desert Webbing

How close are they?

ΔE 6.3, close: similar, with a visible difference side by side. Desert Webbing is cooler than Vampiric Flesh.

Can I use Desert Webbing instead of Vampiric Flesh?

Usually, if you are not matching paint already on the model. Close match (ΔE 6). Desert Webbing is cooler than Vampiric Flesh.

Can I use Vampiric Flesh instead of Desert Webbing?

The same difference applies the other way round: Vampiric Flesh is 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.