ΔE 19.2, loose: different enough that you should pick on purpose. Manganese Blue Hue is a little lighter, much more saturated, warmer than Skink Blue.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 19). Manganese Blue Hue is a little lighter, much more saturated, warmer than Skink Blue.
The same difference applies the other way round: Skink Blue is a little darker, much more muted, 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.
See Skink Blue on the colour wheel See Manganese Blue Hue on the colour wheel
All matches: Skink Blue equivalents · Manganese Blue Hue equivalents