ΔE 6.0, close: similar, with a visible difference side by side. Grey Violet RLM75 is a little lighter than JMSDF 2705 Dark Gray N4.
Usually, if you are not matching paint already on the model. Close match (ΔE 6). Grey Violet RLM75 is a little lighter than JMSDF 2705 Dark Gray N4.
The same difference applies the other way round: JMSDF 2705 Dark Gray N4 is a little darker.
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 JMSDF 2705 Dark Gray N4 on the colour wheel See Grey Violet RLM75 on the colour wheel
All matches: JMSDF 2705 Dark Gray N4 equivalents · Grey Violet RLM75 equivalents