Quinacridone Magenta vs Red

How close are they?

ΔE 7.2, close: similar, with a visible difference side by side. Red is a little lighter than Quinacridone Magenta.

Can I use Red instead of Quinacridone Magenta?

Usually, if you are not matching paint already on the model. Close match (ΔE 7). Red is a little lighter than Quinacridone Magenta.

Can I use Quinacridone Magenta instead of Red?

The same difference applies the other way round: Quinacridone Magenta is a little darker.

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.