ΔE 12.0, fair: the same colour family, but not a straight swap. Grey Violet RLM75 is a little darker than Granite Grey.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 12). Grey Violet RLM75 is a little darker than Granite Grey.
The same difference applies the other way round: Granite Grey 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.
See Granite Grey on the colour wheel See Grey Violet RLM75 on the colour wheel
All matches: Granite Grey equivalents · Grey Violet RLM75 equivalents