I have a plugin that works with standard relationship and post object fields, but I do not know if it will work with the Quick and easy Post creation for ACF Relationship Fields plugin. https://github.com/Hube2/acf-post2post. It’s pretty basic and requires that the relationship field is named the same on all of the post types. There are no settings.
Welcome to the Advanced Custom Fields community forum.
Browse through ideas, snippets of code, questions and answers between fellow ACF users