Waaagh! Flesh vs IJA Green

How close are they?

ΔE 6.5, close: similar, with a visible difference side by side. IJA Green is more muted than Waaagh! Flesh.

Can I use IJA Green instead of Waaagh! Flesh?

Usually, if you are not matching paint already on the model. Close match (ΔE 7). IJA Green is more muted than Waaagh! Flesh.

Can I use Waaagh! Flesh instead of IJA Green?

The same difference applies the other way round: Waaagh! Flesh is more saturated.

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.