Fulgrim Pink vs Pale Pink

How close are they?

ΔE 23.7, loose: different enough that you should pick on purpose. Pale Pink is noticeably lighter, much more muted, warmer than Fulgrim Pink.

Can I use Pale Pink instead of Fulgrim Pink?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 24). Pale Pink is noticeably lighter, much more muted, warmer than Fulgrim Pink.

Can I use Fulgrim Pink instead of Pale Pink?

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