ΔE 8.8, close: similar, with a visible difference side by side. Brainmatter Beige is a little darker, more muted than Zombie Green.
Usually, if you are not matching paint already on the model. Close match (ΔE 9). Brainmatter Beige is a little darker, more muted than Zombie Green.
The same difference applies the other way round: Zombie Green is a little lighter, more saturated.
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 Zombie Green on the colour wheel See Brainmatter Beige on the colour wheel
All matches: Zombie Green equivalents · Brainmatter Beige equivalents