Exile Blue vs Hexed Lichen

How close are they?

ΔE 16.0, loose: different enough that you should pick on purpose. Hexed Lichen is a little lighter, more saturated, warmer than Exile Blue.

Can I use Hexed Lichen instead of Exile Blue?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 16). Hexed Lichen is a little lighter, more saturated, warmer than Exile Blue.

Can I use Exile Blue instead of Hexed Lichen?

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