wpspin

This plugin streamlines content management across different versions of a WordPress site by enabling the export and import of post/page content in JSON format. 
It eliminates the need for manual copying by allowing you to download post details—including content, title, categories, and featured image—into a JSON file. 
This file can then be uploaded to another post, automatically updating its content, custom fields, taxonomies, and featured image. The plugin supports:
<ol>
<li>Post Title</li>
<li>Post Content</li>
<li>Featured Image</li>
<li>Taxonomies: Tag, Category, and Custom Taxonomy</li>
<li>PostMeta / Custom Fields 
Designed to work with major page builders and ACF fields, the plugin offers flexibility to selectively duplicate posts, avoiding the need for full database migration.</li>
</ol>

Post/Page Copying Tool  to Export and Import post/page for Cross site Migration

This plugin adds Export and Import buttons for posts/pages, enabling JSON exports of post details and simplifying content addition.

blogvii

Easy Export Single Post and Page WordPress plugin allows users to easily export individual posts or pages in various formats for seamless sharing and backup.

Easy Export Single Post and Page

Easily export individual posts or pages in various formats for seamless sharing and backup.

Post/Page Copying Tool to Export and Import post/page for Cross site Migration vs Easy Export Single Post and Page