sebastianost

Usage:
To include a post in another post or page, just add [ipost id=id-of-post] and the post will apper instead of [ipost id=id-of-post]  
You can also fetch the post by permalink: [ipost permalink=”?p=4″]. 
You can also set silence to true/false depending if you want debug information to be printed. Defalut is true.(no debug information)

iPost

Plugin that makes it super easy to include one or more posts in another post.

kashanshah

This plugin enables users to add the same content to multiple posts and pages using a shortcode. It functions similarly to PHP’s ‘include’ function.
Users can include HTML, CSS, and JavaScript in their content with a simple shortcode. 
For example, if my brand’s tagline, “The Best Of Its Kind,” needs to be displayed on various pages and posts, I would add it to the Included Content section. The plugin will generate a shortcode for this content, which I can then place wherever I want the tagline to appear.
Additionally, CSS and JavaScript can be added alongside the HTML content, ensuring they are included wherever the shortcode is used.
In the future, if I change my tagline, I only need to update it in the Included Content section, and it will be updated everywhere the shortcode has been used.

Include Content By Shortcode

I’ve been using it on multiple sites. It helps me managing website a lot. A lot of sections are used in multiple pages. Using these sections through shortcode helps me synchronisation among the same sections throughout the website. 

very helpful

This plugin allows you to include content from a custom post type by using a shortcode. You can also add custom CSS and JS to the included content.

iPost vs Include Content By Shortcode