Rich Gold vs Forged Red

How close are they?

ΔE 36.3, loose: different enough that you should pick on purpose. Forged Red is a little darker, more muted, warmer than Rich Gold.

Can I use Forged Red instead of Rich Gold?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 36). Forged Red is a little darker, more muted, warmer than Rich Gold.

Can I use Rich Gold instead of Forged Red?

The same difference applies the other way round: Rich Gold is a little lighter, more saturated, cooler.

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.