ΔE 20.6, loose: different enough that you should pick on purpose. Tooth and Nails is noticeably lighter, more muted, warmer than Forest Faun.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 21). Tooth and Nails is noticeably lighter, more muted, warmer than Forest Faun.
The same difference applies the other way round: Forest Faun is noticeably darker, 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.
See Forest Faun on the colour wheel See Tooth and Nails on the colour wheel
All matches: Forest Faun equivalents · Tooth and Nails equivalents