ΔE 14.2, fair: the same colour family, but not a straight swap. Cavalry Brown is noticeably lighter, warmer than Dark Burgundy.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 14). Cavalry Brown is noticeably lighter, warmer than Dark Burgundy.
The same difference applies the other way round: Dark Burgundy is noticeably darker, 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 Dark Burgundy on the colour wheel See Cavalry Brown on the colour wheel
All matches: Dark Burgundy equivalents · Cavalry Brown equivalents