Dark Sky vs Blue FS15044

How close are they?

ΔE 11.1, fair: the same colour family, but not a straight swap. Blue FS15044 is a little lighter, more muted, warmer than Dark Sky.

Can I use Blue FS15044 instead of Dark Sky?

Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 11). Blue FS15044 is a little lighter, more muted, warmer than Dark Sky.

Can I use Dark Sky instead of Blue FS15044?

The same difference applies the other way round: Dark Sky is a little darker, 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.