[Flutter] Difference between using super.key and (Key? key) : super(key: key) in Flutter

I want to know what's the difference between using {super.key} and (Key? key) : super(key: key) in a Flutter app.

I mean I know they both set key from the super widgets, but why there is 2 types of them? and which is preferred to use?

class MyPublicWidget extends StatelessWidget {
MyPublicWidget({super.key});
}

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