Contagion Green vs Cement Grey

How close are they?

ΔE 9.0, close: similar, with a visible difference side by side. Cement Grey is a little darker, more muted than Contagion Green.

Can I use Cement Grey instead of Contagion Green?

Usually, if you are not matching paint already on the model. Close match (ΔE 9). Cement Grey is a little darker, more muted than Contagion Green.

Can I use Contagion Green instead of Cement Grey?

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

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.