Figgy Pink vs Lustful Purple

How close are they?

ΔE 22.0, loose: different enough that you should pick on purpose. Lustful Purple is noticeably darker, more saturated, cooler than Figgy Pink.

Can I use Lustful Purple instead of Figgy Pink?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 22). Lustful Purple is noticeably darker, more saturated, cooler than Figgy Pink.

Can I use Figgy Pink instead of Lustful Purple?

The same difference applies the other way round: Figgy Pink is noticeably lighter, more muted, warmer.

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.