ΔE 12.2, fair: the same colour family, but not a straight swap. Hiril Blue is a little darker, more muted, cooler than Phantasmal Blue.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 12). Hiril Blue is a little darker, more muted, cooler than Phantasmal Blue.
The same difference applies the other way round: Phantasmal Blue is a little lighter, more saturated, 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 Phantasmal Blue on the colour wheel See Hiril Blue on the colour wheel
All matches: Phantasmal Blue equivalents · Hiril Blue equivalents