Liche Purple vs Royal Purple

How close are they?

ΔE 15.9, loose: different enough that you should pick on purpose. Royal Purple is a little darker, much more muted than Liche Purple.

Can I use Royal Purple instead of Liche Purple?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 16). Royal Purple is a little darker, much more muted than Liche Purple.

Can I use Liche Purple instead of Royal Purple?

The same difference applies the other way round: Liche Purple 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.