ΔE 21.0, loose: different enough that you should pick on purpose. Blushing Rose is a little lighter, warmer than Elder Flower.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 21). Blushing Rose is a little lighter, warmer than Elder Flower.
The same difference applies the other way round: Elder Flower is a little darker, 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 Elder Flower on the colour wheel See Blushing Rose on the colour wheel
All matches: Elder Flower equivalents · Blushing Rose equivalents