The Swan Princess is based on no discernible movie. The small studio ripped off the Disney formula and hoped harassed parents would pick up the VHS, mistaking it for a Disney Princess movie.
Perhaps this is why, years later, Disney got its revenge with The Princess and the Frog. Angry fans of the smaller budget movie complained that the way Naveen (in frog form) looks and behaves similarly to Jean-Bob, Odette’s French frog friend, and the sphere of water when Facilier's spell is broken looks just like Odette’s transformation, and also Louis look resembles to one of the alligators in the moat.
Perhaps that make them even?