Ojamajo Doremi Na-i-sho, Heartcatch Precure! Recommendations
For one point the character design is a obvious similiarity between both, but not quite the only one.
Heartcatch Pretty Cure usually has its quite episodic scheme of having a light focus on a character somewhat close to the main characters, or whom they meet. These characters have troubles, hence get there withering "Heart flowers" stolen and transform into monsters, whose probably one special aspect is that they are now able to freely outspeak their trouble. Doing so, having sometimes the source of their trouble hear that (and with a bit help of the Cures purifying magic of course) their trouble get in some way or