ΔE 11.6, fair: the same colour family, but not a straight swap. Tallarn Sand is a little lighter, more muted than Barren Yellow.
✓ Army Painter Fanatic conversion chart lists these two as equivalents.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 12). Tallarn Sand is a little lighter, more muted than Barren Yellow.
The same difference applies the other way round: Barren Yellow is a little darker, 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 Tallarn Sand on the colour wheel
All matches: Barren Yellow equivalents · Tallarn Sand equivalents