Ultramarines Blue vs Purple Vanity

How close are they?

ΔE 27.5, loose: different enough that you should pick on purpose. Purple Vanity is a little darker, much more muted, warmer than Ultramarines Blue.

Can I use Purple Vanity instead of Ultramarines Blue?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 28). Purple Vanity is a little darker, much more muted, warmer than Ultramarines Blue.

Can I use Ultramarines Blue instead of Purple Vanity?

The same difference applies the other way round: Ultramarines Blue is a little 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.