ΔE 26.7, loose: different enough that you should pick on purpose. Greenish Gold is noticeably lighter, much more muted, cooler than Thallax Gold.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 27). Greenish Gold is noticeably lighter, much more muted, cooler than Thallax Gold.
The same difference applies the other way round: Thallax Gold is noticeably darker, much more saturated, warmer.
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 Greenish Gold on the colour wheel
All matches: Thallax Gold equivalents · Greenish Gold equivalents