ΔE 29.2, loose: different enough that you should pick on purpose. Dead Purple is noticeably darker, more muted, warmer than Hexed Violet.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 29). Dead Purple is noticeably darker, more muted, warmer than Hexed Violet.
The same difference applies the other way round: Hexed Violet is noticeably lighter, more saturated, 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 Hexed Violet on the colour wheel See Dead Purple on the colour wheel
All matches: Hexed Violet equivalents · Dead Purple equivalents