Yes there is - here. That’s maintained as one section (and the organisation was linked from the web page that I mentioned before). If you want to split that further by state (I think that section covers 3) you’d have to talk to the other people involved so that they don’t get a surprise.
… or the guide is aligned with OSM, if it turns out the OSM is “more correct”.
No, that’s just a different section. If you show all the trail sections it should be obvious.