ΔE 13.3, fair: the same colour family, but not a straight swap. Tallarn Sand is a little lighter, more muted, warmer than British Uniform.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 13). Tallarn Sand is a little lighter, more muted, warmer than British Uniform.
The same difference applies the other way round: British Uniform is a little darker, more saturated, 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 British Uniform on the colour wheel See Tallarn Sand on the colour wheel
All matches: British Uniform equivalents · Tallarn Sand equivalents