Basilisk Green vs Iceberg Grey

How close are they?

ΔE 15.8, loose: different enough that you should pick on purpose. Iceberg Grey is a little lighter, more saturated, cooler than Basilisk Green.

Can I use Iceberg Grey instead of Basilisk Green?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 16). Iceberg Grey is a little lighter, more saturated, cooler than Basilisk Green.

Can I use Basilisk Green instead of Iceberg Grey?

The same difference applies the other way round: Basilisk Green is a little darker, more muted, 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.