Merm Green vs Medium Olive

How close are they?

ΔE 7.4, close: similar, with a visible difference side by side. Medium Olive is a little darker, cooler than Merm Green.

Can I use Medium Olive instead of Merm Green?

Usually, if you are not matching paint already on the model. Close match (ΔE 7). Medium Olive is a little darker, cooler than Merm Green.

Can I use Merm Green instead of Medium Olive?

The same difference applies the other way round: Merm Green is a little lighter, 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.