Dark Skin Wash vs Aether Blue

How close are they?

ΔE 48.9, loose: different enough that you should pick on purpose. Aether Blue is noticeably lighter, much more saturated, cooler than Dark Skin Wash.

Can I use Aether Blue instead of Dark Skin Wash?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 49). Aether Blue is noticeably lighter, much more saturated, cooler than Dark Skin Wash.

Can I use Dark Skin Wash instead of Aether Blue?

The same difference applies the other way round: Dark Skin Wash is noticeably darker, much more muted, 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.