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