Precure is an iterative show. That is, most new series are brand new continuities with different staffs that all retain a selection of key elements that make them similar to each other. It's not like Sailor Moon or Ojamajo Doremi where one arc leads into the other with largely the same staff throughout. Basically Toei finally got what it wanted and has a show where it can freely ditch its audience every year and not worry about who has moved on or not. Worries about losing the original audience to age was what made Toei demand certain adjustments for Supers.
So the current series, Happiness Charge Precure is entirely separate from any other Precure show. It does, however, share the same director as Heartcatch Precure so while the character designers are different some other things are more similar than with other Precure shows.
So the current series, Happiness Charge Precure is entirely separate from any other Precure show. It does, however, share the same director as Heartcatch Precure so while the character designers are different some other things are more similar than with other Precure shows.