Necrotic Flesh vs Pastel Green

How close are they?

ΔE 9.5, close: similar, with a visible difference side by side. Pastel Green is more muted, cooler than Necrotic Flesh.

Can I use Pastel Green instead of Necrotic Flesh?

Usually, if you are not matching paint already on the model. Close match (ΔE 9). Pastel Green is more muted, cooler than Necrotic Flesh.

Can I use Necrotic Flesh instead of Pastel Green?

The same difference applies the other way round: Necrotic Flesh is more saturated, 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.