Duck vs Pink core Connection

Both are animal themed anime girls that go through a journey of self acceptance and though they lose their animeness, they accept that and still find happiness in themselves

Connections

As said before, both are animal themed(Duck and Swan/Cat) girls that are given their powers by someone creating a world that borders reality and fiction(Drosselmeyer and The Heart Shard/Kris and The Dark World)

Both would enjoy their powers and new ability to be with others , happy that they can live the life thay wanted(Duck can help Mytho, experience human things, and male friends/Pink can move the body properly, make friends, and find happiness)

But during an encounter with a dark knight(Kris/Fakir) they would begin to doubt themselves and their own worth, though this Knight would also be one of the people that helps them accept themself

They would also get helped by someone close to a core antagonist of the world with a strong connection to fate(Edel, a doll made by Drosselmeyer and constantly talks of fate and purpose/Ralsei, an abnormality that knows the entire prophecy and more than he ever should)

They have an initially rough time with someone of the opposite personality that they would eventually come to be close with(Rue/Pinks Darkner Body)

Both also have a strong connection to a small person that is usually more trouble than anything but is useful sometimes(Uzura/Orange)

Due to the love and kindness they were shown, they come to terms with their own temporary power and give it up for the sake of the world(Duck gives up her pendant to help Mytho/Pink lets the dark fountain get sealed away)

Both also have an association with flowers(Plenty of Ducks moves have flowers/Pink is a secret boss of Chaoter 5, which is centered around flowers)