ΔE 18.5, loose: different enough that you should pick on purpose. Cool Blue is noticeably lighter, much more saturated, cooler than Burnt Moss.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 18). Cool Blue is noticeably lighter, much more saturated, cooler than Burnt Moss.
The same difference applies the other way round: Burnt Moss is noticeably darker, much more muted, 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.
See Burnt Moss on the colour wheel See Cool Blue on the colour wheel
All matches: Burnt Moss equivalents · Cool Blue equivalents