Black Green vs Light Green RLM82

How close are they?

ΔE 7.7, close: similar, with a visible difference side by side. Light Green RLM82 is a little lighter, warmer than Black Green.

Can I use Light Green RLM82 instead of Black Green?

Usually, if you are not matching paint already on the model. Close match (ΔE 8). Light Green RLM82 is a little lighter, warmer than Black Green.

Can I use Black Green instead of Light Green RLM82?

The same difference applies the other way round: Black 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.