ΔE 26.0, loose: different enough that you should pick on purpose. Purple Vanity is noticeably darker, much more muted, warmer than Highlord Blue.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 26). Purple Vanity is noticeably darker, much more muted, warmer than Highlord Blue.
The same difference applies the other way round: Highlord Blue is noticeably lighter, much 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 Highlord Blue on the colour wheel See Purple Vanity on the colour wheel
All matches: Highlord Blue equivalents · Purple Vanity equivalents