Hi,
You can use query builder to fetch the pages which are created by a specific user and write a service to create content package which can be used to install in other instances.
path=/content/we-retail/language-masters/en
1_property=@jcr:content/jcr:createdBy
1_property.operation=equal
1_property.value=rpampana
p.limit=-1
Creating content package:
Adobe Experience Manager Help | Creating Adobe Experience Manager Packages using the JcrPackageManag...
Similarly we can write query for modified data