Fulgrim Pink vs Glazier Blue

How close are they?

ΔE 29.9, loose: different enough that you should pick on purpose. Glazier Blue is a little lighter, much more muted, cooler than Fulgrim Pink.

Can I use Glazier Blue instead of Fulgrim Pink?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 30). Glazier Blue is a little lighter, much more muted, cooler than Fulgrim Pink.

Can I use Fulgrim Pink instead of Glazier Blue?

The same difference applies the other way round: Fulgrim Pink is a little darker, much 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.