Afterglow vs Sun Bleach Yellow

How close are they?

ΔE 18.3, loose: different enough that you should pick on purpose. Sun Bleach Yellow is noticeably darker, more saturated, warmer than Afterglow.

Can I use Sun Bleach Yellow instead of Afterglow?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 18). Sun Bleach Yellow is noticeably darker, more saturated, warmer than Afterglow.

Can I use Afterglow instead of Sun Bleach Yellow?

The same difference applies the other way round: Afterglow is noticeably lighter, more muted, 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.