Goddess Glow vs Demonic Skin

How close are they?

ΔE 17.1, loose: different enough that you should pick on purpose. Demonic Skin is noticeably darker, more muted, cooler than Goddess Glow.

Can I use Demonic Skin instead of Goddess Glow?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 17). Demonic Skin is noticeably darker, more muted, cooler than Goddess Glow.

Can I use Goddess Glow instead of Demonic Skin?

The same difference applies the other way round: Goddess Glow is noticeably lighter, more saturated, 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.