ΔE 13.4, fair: the same colour family, but not a straight swap. UK BSC is more muted, cooler than Buff.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 13). UK BSC is more muted, cooler than Buff.
The same difference applies the other way round: Buff is 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 Buff on the colour wheel See UK BSC on the colour wheel
All matches: Buff equivalents · UK BSC equivalents