ΔE 7.2, close: similar, with a visible difference side by side. Uniform Grey is a little lighter than RLM 75.
Usually, if you are not matching paint already on the model. Close match (ΔE 7). Uniform Grey is a little lighter than RLM 75.
The same difference applies the other way round: RLM 75 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 RLM 75 on the colour wheel See Uniform Grey on the colour wheel
All matches: RLM 75 equivalents · Uniform Grey equivalents