ΔE 20.8, loose: different enough that you should pick on purpose. Cobalt Bluegreen is more saturated, cooler than Forest Faun.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 21). Cobalt Bluegreen is more saturated, cooler than Forest Faun.
The same difference applies the other way round: Forest Faun is 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 Forest Faun on the colour wheel See Cobalt Bluegreen on the colour wheel
All matches: Forest Faun equivalents · Cobalt Bluegreen equivalents