Eidolon Purple Clear vs Hexed Lichen

How close are they?

ΔE 23.7, loose: different enough that you should pick on purpose. Hexed Lichen is a little darker, much more muted than Eidolon Purple Clear.

Can I use Hexed Lichen instead of Eidolon Purple Clear?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 24). Hexed Lichen is a little darker, much more muted than Eidolon Purple Clear.

Can I use Eidolon Purple Clear instead of Hexed Lichen?

The same difference applies the other way round: Eidolon Purple Clear is a little lighter, much 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.