ΔE 18.0, loose: different enough that you should pick on purpose. Warm Brown is a little darker, much more muted than Barren Yellow.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 18). Warm Brown is a little darker, much more muted than Barren Yellow.
The same difference applies the other way round: Barren Yellow is a little lighter, much more saturated.
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 Barren Yellow on the colour wheel See Warm Brown on the colour wheel
All matches: Barren Yellow equivalents · Warm Brown equivalents