Druchii Violet vs Blue Wash

How close are they?

ΔE 48.0, loose: different enough that you should pick on purpose. Blue Wash is noticeably lighter, cooler than Druchii Violet.

Can I use Blue Wash instead of Druchii Violet?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 48). Blue Wash is noticeably lighter, cooler than Druchii Violet.

Can I use Druchii Violet instead of Blue Wash?

The same difference applies the other way round: Druchii Violet is noticeably darker, 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.