Completely separate. 

Keyblades are not used; Social Links will be a thing to a degree. 

So yeah. Rather then use the "Key to your heart metaphor" with a key like thing, you're actions will determine how much light and dark is in you. 
Of course, the actions also can pass as negative or positive based on another's perception. In short, can seem evil to another, but still count as a light action. 

So yes, I hope I answered the questions that go with that.