Toxic Mist vs Antiquity Green

How close are they?

ΔE 22.8, loose: different enough that you should pick on purpose. Antiquity Green is noticeably darker, more muted, warmer than Toxic Mist.

Can I use Antiquity Green instead of Toxic Mist?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 23). Antiquity Green is noticeably darker, more muted, warmer than Toxic Mist.

Can I use Toxic Mist instead of Antiquity Green?

The same difference applies the other way round: Toxic Mist is noticeably lighter, more saturated, 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.