Volupus Pink vs Fairy Skin

How close are they?

ΔE 42.7, loose: different enough that you should pick on purpose. Fairy Skin is much more muted, warmer than Volupus Pink.

Can I use Fairy Skin instead of Volupus Pink?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 43). Fairy Skin is much more muted, warmer than Volupus Pink.

Can I use Volupus Pink instead of Fairy Skin?

The same difference applies the other way round: Volupus Pink is 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.