Plague Toad Venom vs Lime Green

How close are they?

ΔE 17.7, loose: different enough that you should pick on purpose. Lime Green is noticeably darker, more muted than Plague Toad Venom.

Can I use Lime Green instead of Plague Toad Venom?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 18). Lime Green is noticeably darker, more muted than Plague Toad Venom.

Can I use Plague Toad Venom instead of Lime Green?

The same difference applies the other way round: Plague Toad Venom 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.