ΔE 13.5, fair: the same colour family, but not a straight swap. Cardinal Purple is a little darker, more muted than Love Affair.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 14). Cardinal Purple is a little darker, more muted than Love Affair.
The same difference applies the other way round: Love Affair is a little lighter, more saturated.
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 Love Affair on the colour wheel See Cardinal Purple on the colour wheel
All matches: Love Affair equivalents · Cardinal Purple equivalents