ΔE 24.9, loose: different enough that you should pick on purpose. Legacy Blue is noticeably darker, warmer than Leviadon Blue.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 25). Legacy Blue is noticeably darker, warmer than Leviadon Blue.
The same difference applies the other way round: Leviadon Blue is noticeably lighter, 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 Leviadon Blue on the colour wheel See Legacy Blue on the colour wheel
All matches: Leviadon Blue equivalents · Legacy Blue equivalents