ΔE 15.6, loose: different enough that you should pick on purpose. AMT-1 Lt. Grey. Brown is noticeably lighter, more muted than Bestial Green.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 16). AMT-1 Lt. Grey. Brown is noticeably lighter, more muted than Bestial Green.
The same difference applies the other way round: Bestial Green is noticeably darker, 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 Bestial Green on the colour wheel See AMT-1 Lt. Grey. Brown on the colour wheel
All matches: Bestial Green equivalents · AMT-1 Lt. Grey. Brown equivalents