ΔE 31.2, loose: different enough that you should pick on purpose. Light Violet is noticeably darker, much more saturated, cooler than Dechala Lilac.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 31). Light Violet is noticeably darker, much more saturated, cooler than Dechala Lilac.
The same difference applies the other way round: Dechala Lilac 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.
See Dechala Lilac on the colour wheel See Light Violet on the colour wheel
All matches: Dechala Lilac equivalents · Light Violet equivalents