Thornwood Green vs Olive Grey

How close are they?

ΔE 9.3, close: similar, with a visible difference side by side. Olive Grey is more muted, cooler than Thornwood Green.

Can I use Olive Grey instead of Thornwood Green?

Usually, if you are not matching paint already on the model. Close match (ΔE 9). Olive Grey is more muted, cooler than Thornwood Green.

Can I use Thornwood Green instead of Olive Grey?

The same difference applies the other way round: Thornwood Green is more saturated, 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.