Moonpetal vs Lollipop Magenta

How close are they?

ΔE 25.2, loose: different enough that you should pick on purpose. Lollipop Magenta is noticeably darker, much more saturated than Moonpetal.

Can I use Lollipop Magenta instead of Moonpetal?

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

Can I use Moonpetal instead of Lollipop Magenta?

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

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.