Feature summary (what you would like to be able to do and where): I would like a userscript or a tool that is able to sync a set of pages to a different set of pages in a wiki

Use case(s) (list the steps that you performed to discover that problem, and describe the actual underlying problem which you want to solve. Do not describe only a solution): Copy volumes on Wikisource (originally proposed by Bodhi). Also useful for some other cases like syncing templates across wikis.

Benefits (why should this be implemented?):