British Uniform vs Mid DAK Sand

How close are they?

ΔE 16.5, loose: different enough that you should pick on purpose. Mid DAK Sand is noticeably lighter, more muted, warmer than British Uniform.

Can I use Mid DAK Sand instead of British Uniform?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 17). Mid DAK Sand is noticeably lighter, more muted, warmer than British Uniform.

Can I use British Uniform instead of Mid DAK Sand?

The same difference applies the other way round: British Uniform is noticeably darker, more saturated, 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.