Mid DAK Sand vs Dark Sun Yellow

How close are they?

ΔE 6.9, close: similar, with a visible difference side by side. Dark Sun Yellow is more saturated, warmer than Mid DAK Sand.

Can I use Dark Sun Yellow instead of Mid DAK Sand?

Usually, if you are not matching paint already on the model. Close match (ΔE 7). Dark Sun Yellow is more saturated, warmer than Mid DAK Sand.

Can I use Mid DAK Sand instead of Dark Sun Yellow?

The same difference applies the other way round: Mid DAK Sand is more muted, 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.