A group of Microsoft Products and technologies used for sharing and managing content, knowledge, and applications.
Hi XinYi_Solutions,
I go through the post carefully. I am sorry to say there could be no built-in features in SharePoint to sync two Text Web Part. And in Microsoft Power Automate, there could be no connector related to SharePoint Web Part.
As a workaround, you may try using other web parts in SharePoint page, like use file link in File Viewer web parts to display contents you want. You may edit the document that linked to the web part and all web part will get the update,
Best Regards,
Clark