ΔE 8.6, close: similar, with a visible difference side by side. Purple Hex is a little darker than Space Magenta.
Usually, if you are not matching paint already on the model. Close match (ΔE 9). Purple Hex is a little darker than Space Magenta.
The same difference applies the other way round: Space Magenta is a little lighter.
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 Space Magenta on the colour wheel See Purple Hex on the colour wheel
All matches: Space Magenta equivalents · Purple Hex equivalents