ΔE 16.8, loose: different enough that you should pick on purpose. Elven Gold is a little darker, much more muted than Thallax Gold.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 17). Elven Gold is a little darker, much more muted than Thallax Gold.
The same difference applies the other way round: Thallax Gold is a little lighter, 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 Thallax Gold on the colour wheel See Elven Gold on the colour wheel
All matches: Thallax Gold equivalents · Elven Gold equivalents