ΔE 24.8, loose: different enough that you should pick on purpose. Nocturne Skin is a little lighter, much more muted, warmer than Triumphant Navy.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 25). Nocturne Skin is a little lighter, much more muted, warmer than Triumphant Navy.
The same difference applies the other way round: Triumphant Navy is a little darker, much more saturated, 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 Triumphant Navy on the colour wheel See Nocturne Skin on the colour wheel
All matches: Triumphant Navy equivalents · Nocturne Skin equivalents