Shifting Sands vs Aged Metal

How close are they?

ΔE 20.3, loose: different enough that you should pick on purpose. Aged Metal is noticeably lighter, cooler than Shifting Sands.

Can I use Aged Metal instead of Shifting Sands?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 20). Aged Metal is noticeably lighter, cooler than Shifting Sands.

Can I use Shifting Sands instead of Aged Metal?

The same difference applies the other way round: Shifting Sands is noticeably darker, 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.