ΔE 38.2, loose: different enough that you should pick on purpose. Tempest Blue Wash is noticeably lighter, much more muted, cooler than Druchii Violet.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 38). Tempest Blue Wash is noticeably lighter, much more muted, cooler than Druchii Violet.
The same difference applies the other way round: Druchii Violet is noticeably darker, much more saturated, 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 Druchii Violet on the colour wheel See Tempest Blue Wash on the colour wheel
All matches: Druchii Violet equivalents · Tempest Blue Wash equivalents