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