Shiny Gold vs Greenish Gold

How close are they?

ΔE 29.2, loose: different enough that you should pick on purpose. Greenish Gold is noticeably lighter, much more muted than Shiny Gold.

Can I use Greenish Gold instead of Shiny Gold?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 29). Greenish Gold is noticeably lighter, much more muted than Shiny Gold.

Can I use Shiny Gold instead of Greenish Gold?

The same difference applies the other way round: Shiny Gold is noticeably 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.