ΔE 17.1, loose: different enough that you should pick on purpose. Hexed Lichen is much more saturated, warmer than Indigo.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 17). Hexed Lichen is much more saturated, warmer than Indigo.
The same difference applies the other way round: Indigo is much 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.
See Indigo on the colour wheel See Hexed Lichen on the colour wheel
All matches: Indigo equivalents · Hexed Lichen equivalents