Space Green vs Warboss Green

How close are they?

ΔE 9.7, close: similar, with a visible difference side by side. Warboss Green is a little lighter, more saturated, warmer than Space Green.

Can I use Warboss Green instead of Space Green?

Usually, if you are not matching paint already on the model. Close match (ΔE 10). Warboss Green is a little lighter, more saturated, warmer than Space Green.

Can I use Space Green instead of Warboss Green?

The same difference applies the other way round: Space Green is a little darker, more muted, 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.