Is it possible to deploy changes from a Staging environment to production environment without custom code or solution packages?

Basically, I don't want to disturb an existing content. Suppose in dev server I have added a XSLT webpart to a site say through SP Designer and customized that.

How can I take it from the staging server to production via PowerShell? I mean how can I replicate (without disturbing content) same customization to OOB content through powershell command in SharePoint 2010?