ΔE 10.8, fair: the same colour family, but not a straight swap. Elfic Blue is a little lighter, warmer than Rainfall Blue.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 11). Elfic Blue is a little lighter, warmer than Rainfall Blue.
The same difference applies the other way round: Rainfall Blue 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 Rainfall Blue on the colour wheel See Elfic Blue on the colour wheel
All matches: Rainfall Blue equivalents · Elfic Blue equivalents