Using Content Mirror plugin you can easily mirror your WordPress site content from one page or post to another, even you can do this between subsites in a WordPress multisite network.
Install and activate Content Mirror. After activation the plugin adds its tiny MCE button in content visual editor which you can use for mirroring content. You can read its full online documentation for all its shortcodes and usage at klasehnemark.com/content-mirror.
This is how mirrored content looks like in visual editor:
Dialog box for selecting what content will be mirrored:
The plugin mirrors content from pages, posts and custom post types and display it on other pages, posts and also custom post types. The plugin is multisite compatible and works between sites in a Multisite network configuration. For instance, if you have a web site with one site for each language, you only reuse the same information on all sites.