ΔE 29.5, loose: different enough that you should pick on purpose. Belladonna Green is a little lighter, much more muted, cooler than Mantis Warriors Green.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 30). Belladonna Green is a little lighter, much more muted, cooler than Mantis Warriors Green.
The same difference applies the other way round: Mantis Warriors Green is a little darker, 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 Mantis Warriors Green on the colour wheel See Belladonna Green on the colour wheel
All matches: Mantis Warriors Green equivalents · Belladonna Green equivalents