Figgy Pink vs Dechala Lilac

How close are they?

ΔE 23.7, loose: different enough that you should pick on purpose. Dechala Lilac is noticeably darker, much more saturated, cooler than Figgy Pink.

Can I use Dechala Lilac instead of Figgy Pink?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 24). Dechala Lilac is noticeably darker, much more saturated, cooler than Figgy Pink.

Can I use Figgy Pink instead of Dechala Lilac?

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