ΔE 18.7, loose: different enough that you should pick on purpose. Buff is noticeably lighter, more muted, warmer than Camo Green.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 19). Buff is noticeably lighter, more muted, warmer than Camo Green.
The same difference applies the other way round: Camo Green 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 Camo Green on the colour wheel See Buff on the colour wheel
All matches: Camo Green equivalents · Buff equivalents