ΔE 7.3, close: similar, with a visible difference side by side. Dark Blue RLM24 is a little lighter than Marine Blue.
Usually, if you are not matching paint already on the model. Close match (ΔE 7). Dark Blue RLM24 is a little lighter than Marine Blue.
The same difference applies the other way round: Marine Blue 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 Marine Blue on the colour wheel See Dark Blue RLM24 on the colour wheel
All matches: Marine Blue equivalents · Dark Blue RLM24 equivalents