Mossy Green vs Gray Green

How close are they?

ΔE 15.1, loose: different enough that you should pick on purpose. Gray Green is noticeably darker, more muted, warmer than Mossy Green.

Can I use Gray Green instead of Mossy Green?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 15). Gray Green is noticeably darker, more muted, warmer than Mossy Green.

Can I use Mossy Green instead of Gray Green?

The same difference applies the other way round: Mossy Green is noticeably lighter, 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.