Elysian Green vs Ethereal Green

How close are they?

ΔE 8.1, close: similar, with a visible difference side by side. Ethereal Green is a little darker, cooler than Elysian Green.

Can I use Ethereal Green instead of Elysian Green?

Usually, if you are not matching paint already on the model. Close match (ΔE 8). Ethereal Green is a little darker, cooler than Elysian Green.

Can I use Elysian Green instead of Ethereal Green?

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