Luxion Purple vs Royal Purple

How close are they?

ΔE 15.2, loose: different enough that you should pick on purpose. Royal Purple is a little darker, more saturated than Luxion Purple.

Can I use Royal Purple instead of Luxion Purple?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 15). Royal Purple is a little darker, more saturated than Luxion Purple.

Can I use Luxion Purple instead of Royal Purple?

The same difference applies the other way round: Luxion Purple is a little 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.