ΔE 14.2, fair: the same colour family, but not a straight swap. Radiant Yellow is noticeably lighter than Thallax Gold.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 14). Radiant Yellow is noticeably lighter than Thallax Gold.
The same difference applies the other way round: Thallax Gold is noticeably darker.
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 Thallax Gold on the colour wheel See Radiant Yellow on the colour wheel
All matches: Thallax Gold equivalents · Radiant Yellow equivalents