ΔE 17.4, loose: different enough that you should pick on purpose. Crimson is a little lighter, cooler than Space Red.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 17). Crimson is a little lighter, cooler than Space Red.
The same difference applies the other way round: Space Red is a little darker, 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 Space Red on the colour wheel See Crimson on the colour wheel
All matches: Space Red equivalents · Crimson equivalents