ΔE 12.8, fair: the same colour family, but not a straight swap. Brass is noticeably lighter, more saturated than Burnt Tin.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 13). Brass is noticeably lighter, more saturated than Burnt Tin.
The same difference applies the other way round: Burnt Tin is noticeably darker, more muted.
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 Burnt Tin on the colour wheel See Brass on the colour wheel
All matches: Burnt Tin equivalents · Brass equivalents