Basilisk Green vs Black Lotus

How close are they?

ΔE 15.6, loose: different enough that you should pick on purpose. Black Lotus is noticeably darker, more muted than Basilisk Green.

Can I use Black Lotus instead of Basilisk Green?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 16). Black Lotus is noticeably darker, more muted than Basilisk Green.

Can I use Basilisk Green instead of Black Lotus?

The same difference applies the other way round: Basilisk Green is noticeably 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.