Lupercal Green vs Emerald Green

How close are they?

ΔE 9.2, close: similar, with a visible difference side by side. Emerald Green is a little lighter, warmer than Lupercal Green.

Can I use Emerald Green instead of Lupercal Green?

Usually, if you are not matching paint already on the model. Close match (ΔE 9). Emerald Green is a little lighter, warmer than Lupercal Green.

Can I use Lupercal Green instead of Emerald Green?

The same difference applies the other way round: Lupercal Green is a little darker, 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.