ΔE 9.9, close: similar, with a visible difference side by side. Brown Sand is a little lighter, more saturated than Cypress Brown.
Usually, if you are not matching paint already on the model. Close match (ΔE 10). Brown Sand is a little lighter, more saturated than Cypress Brown.
The same difference applies the other way round: Cypress Brown is a little darker, 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 Cypress Brown on the colour wheel See Brown Sand on the colour wheel
All matches: Cypress Brown equivalents · Brown Sand equivalents