ΔE 6.4, close: similar, with a visible difference side by side. US Earth Red is more saturated, warmer than Brown FS30219.
Usually, if you are not matching paint already on the model. Close match (ΔE 6). US Earth Red is more saturated, warmer than Brown FS30219.
The same difference applies the other way round: Brown FS30219 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.
See Brown FS30219 on the colour wheel See US Earth Red on the colour wheel
All matches: Brown FS30219 equivalents · US Earth Red equivalents