Will N1ED extend my CKEditor in Drupal 8 or replace it?
I want to install N1ED into my D8. Will it extend the current CKEditor or replace it with its own build? I worry because I use 3rd party add-ons.
N1ED will not replace your current CKEditor installation: it will extend it. All your active plugins will be kept and there will be no intersection due to technically N1ED is an add-on for CKEditor itself.
In Drupal control panel N1ED will perfectly work with Text Formats: it will add new options to let you configure N1ED and all its components.