ΔE 16.0, loose: different enough that you should pick on purpose. Plague Green is a little lighter, more saturated, warmer than Basilisk Green.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 16). Plague Green is a little lighter, more saturated, warmer than Basilisk Green.
The same difference applies the other way round: Basilisk Green is a little darker, more muted, 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 Basilisk Green on the colour wheel See Plague Green on the colour wheel
All matches: Basilisk Green equivalents · Plague Green equivalents