ΔE 16.0, loose: different enough that you should pick on purpose. Orange Brown is a little darker, much more muted, cooler than Vulcan Orange.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 16). Orange Brown is a little darker, much more muted, cooler than Vulcan Orange.
The same difference applies the other way round: Vulcan Orange is a little lighter, much more saturated, warmer.
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 Vulcan Orange on the colour wheel See Orange Brown on the colour wheel
All matches: Vulcan Orange equivalents · Orange Brown equivalents