Elder Flower vs Antique Rose

How close are they?

ΔE 22.0, loose: different enough that you should pick on purpose. Antique Rose is a little darker, more muted, warmer than Elder Flower.

Can I use Antique Rose instead of Elder Flower?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 22). Antique Rose is a little darker, more muted, warmer than Elder Flower.

Can I use Elder Flower instead of Antique Rose?

The same difference applies the other way round: Elder Flower is a little lighter, more saturated, 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.