ΔE 15.9, loose: different enough that you should pick on purpose. Garnet Purple is a little lighter, more muted, cooler than Sigvald Burgundy.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 16). Garnet Purple is a little lighter, more muted, cooler than Sigvald Burgundy.
The same difference applies the other way round: Sigvald Burgundy is a little darker, 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 Sigvald Burgundy on the colour wheel See Garnet Purple on the colour wheel
All matches: Sigvald Burgundy equivalents · Garnet Purple equivalents