Old Gold vs Red Copper

How close are they?

ΔE 14.2, fair: the same colour family, but not a straight swap. Red Copper is a little darker, cooler than Old Gold.

Can I use Red Copper instead of Old Gold?

Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 14). Red Copper is a little darker, cooler than Old Gold.

Can I use Old Gold instead of Red Copper?

The same difference applies the other way round: Old Gold is a little lighter, 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.