ΔE 7.9, close: similar, with a visible difference side by side. Medium Gray is a little lighter, more muted than Grayish Blue FS35237.
Usually, if you are not matching paint already on the model. Close match (ΔE 8). Medium Gray is a little lighter, more muted than Grayish Blue FS35237.
The same difference applies the other way round: Grayish Blue FS35237 is a little darker, more saturated.
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 Grayish Blue FS35237 on the colour wheel See Medium Gray on the colour wheel
All matches: Grayish Blue FS35237 equivalents · Medium Gray equivalents