Nurgling Green vs Traitor Green

How close are they?

ΔE 6.2, close: similar, with a visible difference side by side. Traitor Green is a little darker, warmer than Nurgling Green.

Can I use Traitor Green instead of Nurgling Green?

Usually, if you are not matching paint already on the model. Close match (ΔE 6). Traitor Green is a little darker, warmer than Nurgling Green.

Can I use Nurgling Green instead of Traitor Green?

The same difference applies the other way round: Nurgling Green is a little lighter, cooler.

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.