ΔE 10.4, fair: the same colour family, but not a straight swap. Flash Gitz Yellow is more saturated than Radiant Yellow.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 10). Flash Gitz Yellow is more saturated than Radiant Yellow.
The same difference applies the other way round: Radiant Yellow is more muted.
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 Radiant Yellow on the colour wheel See Flash Gitz Yellow on the colour wheel
All matches: Radiant Yellow equivalents · Flash Gitz Yellow equivalents