Anthraquinone Blue vs Violet Vamp

How close are they?

ΔE 17.1, loose: different enough that you should pick on purpose. Violet Vamp is noticeably lighter, much more muted than Anthraquinone Blue.

Can I use Violet Vamp instead of Anthraquinone Blue?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 17). Violet Vamp is noticeably lighter, much more muted than Anthraquinone Blue.

Can I use Anthraquinone Blue instead of Violet Vamp?

The same difference applies the other way round: Anthraquinone Blue is noticeably darker, much more saturated.

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.