Princess Pink vs Skull Linen

How close are they?

ΔE 31.3, loose: different enough that you should pick on purpose. Skull Linen is noticeably darker, much more muted than Princess Pink.

Can I use Skull Linen instead of Princess Pink?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 31). Skull Linen is noticeably darker, much more muted than Princess Pink.

Can I use Princess Pink instead of Skull Linen?

The same difference applies the other way round: Princess Pink is noticeably lighter, much more saturated.

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.