ΔE 34.2, loose: different enough that you should pick on purpose. Snake Green is noticeably darker, much more muted, cooler than Belladonna Green.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 34). Snake Green is noticeably darker, much more muted, cooler than Belladonna Green.
The same difference applies the other way round: Belladonna Green is noticeably lighter, much more saturated, 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 Belladonna Green on the colour wheel See Snake Green on the colour wheel
All matches: Belladonna Green equivalents · Snake Green equivalents