ΔE 13.1, fair: the same colour family, but not a straight swap. IDF Blue is a little lighter, much more saturated than Slate Grey.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 13). IDF Blue is a little lighter, much more saturated than Slate Grey.
The same difference applies the other way round: Slate Grey is a little darker, 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 Slate Grey on the colour wheel See IDF Blue on the colour wheel
All matches: Slate Grey equivalents · IDF Blue equivalents