ΔE 18.7, loose: different enough that you should pick on purpose. Orange Brown is a little lighter, much more saturated than Brown (JGSDF).
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 19). Orange Brown is a little lighter, much more saturated than Brown (JGSDF).
The same difference applies the other way round: Brown (JGSDF) is a little darker, much 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 Brown (JGSDF) on the colour wheel See Orange Brown on the colour wheel
All matches: Brown (JGSDF) equivalents · Orange Brown equivalents