ΔE 10.6, fair: the same colour family, but not a straight swap. Mica Blue is noticeably darker than Calth Blue Clear.
Can I use Mica Blue instead of Calth Blue Clear?
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 11). Mica Blue is noticeably darker than Calth Blue Clear.
Can I use Calth Blue Clear instead of Mica Blue?
The same difference applies the other way round: Calth Blue Clear is noticeably lighter.
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.