ΔE 10.5, fair: the same colour family, but not a straight swap. Dark Blue is more saturated than Blue FS15050.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 11). Dark Blue is more saturated than Blue FS15050.
The same difference applies the other way round: Blue FS15050 is more muted.
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 Blue FS15050 on the colour wheel See Dark Blue on the colour wheel
All matches: Blue FS15050 equivalents · Dark Blue equivalents