ΔE 19.5, loose: different enough that you should pick on purpose. Lustful Purple is noticeably darker, much more saturated, warmer than Decadent Purple.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 19). Lustful Purple is noticeably darker, much more saturated, warmer than Decadent Purple.
The same difference applies the other way round: Decadent Purple is noticeably lighter, 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 Decadent Purple on the colour wheel See Lustful Purple on the colour wheel
All matches: Decadent Purple equivalents · Lustful Purple equivalents