Sherwood Green vs Dirty Grey

How close are they?

ΔE 9.7, close: similar, with a visible difference side by side. Dirty Grey is more muted, warmer than Sherwood Green.

Can I use Dirty Grey instead of Sherwood Green?

Usually, if you are not matching paint already on the model. Close match (ΔE 10). Dirty Grey is more muted, warmer than Sherwood Green.

Can I use Sherwood Green instead of Dirty Grey?

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