Tainted Gold vs Rich Gold

How close are they?

ΔE 20.2, loose: different enough that you should pick on purpose. Rich Gold is noticeably lighter, much more saturated than Tainted Gold.

Can I use Rich Gold instead of Tainted Gold?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 20). Rich Gold is noticeably lighter, much more saturated than Tainted Gold.

Can I use Tainted Gold instead of Rich Gold?

The same difference applies the other way round: Tainted Gold is noticeably darker, much more muted.

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.