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