ΔE 11.1, fair: the same colour family, but not a straight swap. Ruby Red is a little darker, more saturated than Garnet Alchemy.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 11). Ruby Red is a little darker, more saturated than Garnet Alchemy.
The same difference applies the other way round: Garnet Alchemy is a little lighter, 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 Garnet Alchemy on the colour wheel See Ruby Red on the colour wheel
All matches: Garnet Alchemy equivalents · Ruby Red equivalents