IJA Grey Green vs IJA Light Grey Green

How close are they?

ΔE 9.2, close: similar, with a visible difference side by side. IJA Light Grey Green is more saturated than IJA Grey Green.

Can I use IJA Light Grey Green instead of IJA Grey Green?

Usually, if you are not matching paint already on the model. Close match (ΔE 9). IJA Light Grey Green is more saturated than IJA Grey Green.

Can I use IJA Grey Green instead of IJA Light Grey Green?

The same difference applies the other way round: IJA Grey Green is more muted.

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.