ΔE 22.3, loose: different enough that you should pick on purpose. Manganese Blue Hue is noticeably darker, much more saturated, warmer than Bright Sapphire.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 22). Manganese Blue Hue is noticeably darker, much more saturated, warmer than Bright Sapphire.
The same difference applies the other way round: Bright Sapphire is noticeably lighter, 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 Bright Sapphire on the colour wheel See Manganese Blue Hue on the colour wheel
All matches: Bright Sapphire equivalents · Manganese Blue Hue equivalents