ΔE 12.9, fair: the same colour family, but not a straight swap. Greenish Gold is a little lighter, much more muted than Radium.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 13). Greenish Gold is a little lighter, much more muted than Radium.
The same difference applies the other way round: Radium is a little darker, much more saturated.
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 Radium on the colour wheel See Greenish Gold on the colour wheel
All matches: Radium equivalents · Greenish Gold equivalents