Mecha Dark Green vs Angel Green

How close are they?

ΔE 9.4, close: similar, with a visible difference side by side. Angel Green is warmer than Mecha Dark Green.

Can I use Angel Green instead of Mecha Dark Green?

Usually, if you are not matching paint already on the model. Close match (ΔE 9). Angel Green is warmer than Mecha Dark Green.

Can I use Mecha Dark Green instead of Angel Green?

The same difference applies the other way round: Mecha Dark Green is 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.