True Copper vs Shifting Sands

How close are they?

ΔE 20.4, loose: different enough that you should pick on purpose. Shifting Sands is noticeably lighter, much more muted than True Copper.

Can I use Shifting Sands instead of True Copper?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 20). Shifting Sands is noticeably lighter, much more muted than True Copper.

Can I use True Copper instead of Shifting Sands?

The same difference applies the other way round: True Copper 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.