ΔE 36.7, loose: different enough that you should pick on purpose. Garnet Purple is noticeably darker, much more muted, cooler than Volupus Pink.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 37). Garnet Purple is noticeably darker, much more muted, cooler than Volupus Pink.
The same difference applies the other way round: Volupus Pink is noticeably lighter, much 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 Volupus Pink on the colour wheel See Garnet Purple on the colour wheel
All matches: Volupus Pink equivalents · Garnet Purple equivalents