ΔE 12.9, fair: the same colour family, but not a straight swap. Night Blue is a little darker than Hookers Green Hue.
Can I use Night Blue instead of Hookers Green Hue?
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 13). Night Blue is a little darker than Hookers Green Hue.
Can I use Hookers Green Hue instead of Night Blue?
The same difference applies the other way round: Hookers Green Hue is a little lighter.
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.