Neither of them are 5-HT2b agonists, the cardiac effects of cisapride are due to inhibition of the cardiac HERG K+ channel, but apparently this does not seem to be as of an issue with prucalopride [1].

[1] https://onlinelibrary.wiley.com/doi/10.1111/j.1365-2036.2012...

No, Prucalopride was specifically studied for cardiac complications.

Why is there so much rampant misinformation in this comment section when the facts are a simple Google search away?