ΔE 10.9, fair: the same colour family, but not a straight swap. Royal Blue is a little lighter, more muted than Mica Blue.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 11). Royal Blue is a little lighter, more muted than Mica Blue.
The same difference applies the other way round: Mica Blue is a little darker, more saturated.
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 Mica Blue on the colour wheel See Royal Blue on the colour wheel
All matches: Mica Blue equivalents · Royal Blue equivalents