ΔE 16.7, loose: different enough that you should pick on purpose. Macragge Blue is noticeably lighter, cooler than Midnight Blue.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 17). Macragge Blue is noticeably lighter, cooler than Midnight Blue.
The same difference applies the other way round: Midnight Blue is noticeably darker, 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 Midnight Blue on the colour wheel See Macragge Blue on the colour wheel
All matches: Midnight Blue equivalents · Macragge Blue equivalents