ΔE 16.1, loose: different enough that you should pick on purpose. Greenish Gold is a little lighter, much more muted, cooler than Green Sun.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 16). Greenish Gold is a little lighter, much more muted, cooler than Green Sun.
The same difference applies the other way round: Green Sun is a little 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 Green Sun on the colour wheel See Greenish Gold on the colour wheel
All matches: Green Sun equivalents · Greenish Gold equivalents