ΔE 12.1, fair: the same colour family, but not a straight swap. Agate Skin is more saturated, warmer than Old Rose.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 12). Agate Skin is more saturated, warmer than Old Rose.
The same difference applies the other way round: Old Rose is more muted, 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 Old Rose on the colour wheel See Agate Skin on the colour wheel
All matches: Old Rose equivalents · Agate Skin equivalents