Muddy Olive vs Dark Green

How close are they?

ΔE 9.0, close: similar, with a visible difference side by side. Dark Green is a little darker, cooler than Muddy Olive.

Can I use Dark Green instead of Muddy Olive?

Usually, if you are not matching paint already on the model. Close match (ΔE 9). Dark Green is a little darker, cooler than Muddy Olive.

Can I use Muddy Olive instead of Dark Green?

The same difference applies the other way round: Muddy Olive 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.