ΔE 22.1, loose: different enough that you should pick on purpose. Dark Blue RLM24 is a little darker, much more saturated than Fade to Black.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 22). Dark Blue RLM24 is a little darker, much more saturated than Fade to Black.
The same difference applies the other way round: Fade to Black 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 Fade to Black on the colour wheel See Dark Blue RLM24 on the colour wheel
All matches: Fade to Black equivalents · Dark Blue RLM24 equivalents