ΔE 14.5, fair: the same colour family, but not a straight swap. Cokum Copper is a little lighter, much more saturated than Dark DAK Sand.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 14). Cokum Copper is a little lighter, much more saturated than Dark DAK Sand.
The same difference applies the other way round: Dark DAK Sand is a little 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.
See Dark DAK Sand on the colour wheel See Cokum Copper on the colour wheel
All matches: Dark DAK Sand equivalents · Cokum Copper equivalents