ΔE 8.6, close: similar, with a visible difference side by side. USA Flat Brown is a little lighter than Cypress Brown.
Usually, if you are not matching paint already on the model. Close match (ΔE 9). USA Flat Brown is a little lighter than Cypress Brown.
The same difference applies the other way round: Cypress Brown is a little darker.
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 USA Flat Brown on the colour wheel
All matches: Cypress Brown equivalents · USA Flat Brown equivalents