ΔE 10.9, fair: the same colour family, but not a straight swap. Blushing Rose is a little lighter, more saturated, cooler than Ruddy Umber.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 11). Blushing Rose is a little lighter, more saturated, cooler than Ruddy Umber.
The same difference applies the other way round: Ruddy Umber is a little darker, more muted, 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 Ruddy Umber on the colour wheel See Blushing Rose on the colour wheel
All matches: Ruddy Umber equivalents · Blushing Rose equivalents