Pixie Pink vs Fulgrim Pink

How close are they?

ΔE 22.7, loose: different enough that you should pick on purpose. Fulgrim Pink is noticeably lighter, much more muted than Pixie Pink.

Can I use Fulgrim Pink instead of Pixie Pink?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 23). Fulgrim Pink is noticeably lighter, much more muted than Pixie Pink.

Can I use Pixie Pink instead of Fulgrim Pink?

The same difference applies the other way round: Pixie Pink is noticeably darker, 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.