Magento 2 Duplicate CMS Page/Block extension saves much time for admin by allowing them to easily duplicate CMS Pages and Blocks just by one click.Key features of this extension:
In CMS page and block detailed page, there will be a duplicate button provided.
Mass Duplicate action is available in CMS Page and Blocks grid view.
After duplicating CMS Page and Blocks. there will be a successful message displayed
Copied CMS Pages will be given new URL key and Blocks will be given new identifiers.