ΔE 5.5, very close: most people won’t see a difference side by side. Mustard Brown is a little lighter, warmer than Brown (JGSDF).
Yes, for most jobs. Very close match (ΔE 6). Mustard Brown is a little lighter, warmer than Brown (JGSDF).
The same difference applies the other way round: Brown (JGSDF) is a little darker, 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 (JGSDF) on the colour wheel See Mustard Brown on the colour wheel
All matches: Brown (JGSDF) equivalents · Mustard Brown equivalents