ΔE 27.2, loose: different enough that you should pick on purpose. Azure is a little darker, much more muted than Neptune's Fury.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 27). Azure is a little darker, much more muted than Neptune's Fury.
The same difference applies the other way round: Neptune's Fury is a little lighter, much 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 Neptune's Fury on the colour wheel See Azure on the colour wheel
All matches: Neptune's Fury equivalents · Azure equivalents