I don’t think that you can do this AND get ACF to save all of the fields to both the current post and the new post. You could use an acf/save_post filter and just create the new post, by I don’t know how you’d get ACF to save values.
I would probably look into checking/setting post locking so that multiple people cannot edit at the same time. I don’t know what’s involved or how to do it. All I can do is point you to this https://codex.wordpress.org/Function_Reference/wp_check_post_lock
