They have nothing directly to do with each other. Articy:Draft can export XML and perhaps other formats that can in turn be read by scripts (in Unity), provided they are written for that purpose. I recommend to look for special narrative assets for Unity, if that’s you want to do mainly.
Playmaker complements or replaces scripts in Unity, and uses an approach called (finite) state machines. It’s amazing, but it is not a solution tailor-made for narrative. You can build anything you want, including interactive stories. But beware, it’s NOT a tool to build dialogue trees etc specifically. There are certainly other assets made for that purpose that may be better suited for you.
With that said, Playmaker can be expanded with custom scripts and also has (free) addons. There’s one called Datamaker that can read XML, for instance, and so in theory, can load in the XLM export from Articy:Draft, but you probably need to figure out how (likely not just export and load). See this
tutorial to get an idea.