Emerald Scream vs Light Emerald

How close are they?

ΔE 6.6, close: similar, with a visible difference side by side. Light Emerald is more muted, cooler than Emerald Scream.

Can I use Light Emerald instead of Emerald Scream?

Usually, if you are not matching paint already on the model. Close match (ΔE 7). Light Emerald is more muted, cooler than Emerald Scream.

Can I use Emerald Scream instead of Light Emerald?

The same difference applies the other way round: Emerald Scream 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.