ΔE 16.6, loose: different enough that you should pick on purpose. Marine Blue is noticeably lighter, more muted than Triumphant Navy.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 17). Marine Blue is noticeably lighter, more muted than Triumphant Navy.
The same difference applies the other way round: Triumphant Navy is noticeably darker, more saturated.
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 Triumphant Navy on the colour wheel See Marine Blue on the colour wheel
All matches: Triumphant Navy equivalents · Marine Blue equivalents