Space Magenta vs Dark Rose

How close are they?

ΔE 6.4, close: similar, with a visible difference side by side. Dark Rose is more muted, warmer than Space Magenta.

Can I use Dark Rose instead of Space Magenta?

Usually, if you are not matching paint already on the model. Close match (ΔE 6). Dark Rose is more muted, warmer than Space Magenta.

Can I use Space Magenta instead of Dark Rose?

The same difference applies the other way round: Space Magenta is more saturated, 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.