ΔE 8.4, close: similar, with a visible difference side by side. Medium Blue is a little darker, cooler than Twilight Purple.
Usually, if you are not matching paint already on the model. Close match (ΔE 8). Medium Blue is a little darker, cooler than Twilight Purple.
The same difference applies the other way round: Twilight Purple is a little lighter, warmer.
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 Twilight Purple on the colour wheel See Medium Blue on the colour wheel
All matches: Twilight Purple equivalents · Medium Blue equivalents