Sakura vs Crimson Magenta

How close are they?

ΔE 24.6, loose: different enough that you should pick on purpose. Crimson Magenta is noticeably darker, more saturated, cooler than Sakura.

Can I use Crimson Magenta instead of Sakura?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 25). Crimson Magenta is noticeably darker, more saturated, cooler than Sakura.

Can I use Sakura instead of Crimson Magenta?

The same difference applies the other way round: Sakura is noticeably lighter, more muted, 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.