El Dorado vs Greenish Gold

How close are they?

ΔE 27.9, loose: different enough that you should pick on purpose. Greenish Gold is noticeably lighter, much more muted, cooler than El Dorado.

Can I use Greenish Gold instead of El Dorado?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 28). Greenish Gold is noticeably lighter, much more muted, cooler than El Dorado.

Can I use El Dorado instead of Greenish Gold?

The same difference applies the other way round: El Dorado 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.