Sorcerer's Cloak vs Hexed Lichen

How close are they?

ΔE 16.5, loose: different enough that you should pick on purpose. Hexed Lichen is noticeably darker, more saturated than Sorcerer's Cloak.

Can I use Hexed Lichen instead of Sorcerer's Cloak?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 17). Hexed Lichen is noticeably darker, more saturated than Sorcerer's Cloak.

Can I use Sorcerer's Cloak instead of Hexed Lichen?

The same difference applies the other way round: Sorcerer's Cloak is noticeably lighter, more muted.

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.