ΔE 14.7, fair: the same colour family, but not a straight swap. Valkyrie Yellow is a little darker, more saturated, warmer than Afterglow.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 15). Valkyrie Yellow is a little darker, more saturated, warmer than Afterglow.
The same difference applies the other way round: Afterglow is a little 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.
See Afterglow on the colour wheel See Valkyrie Yellow on the colour wheel
All matches: Afterglow equivalents · Valkyrie Yellow equivalents