Hi,

The Odoo Community Association (OCA) has the OpenUpgrade project.It handles schema changes between versions and migrates blog posts, attachments, and relations.

Refer : 

- https://odoo-community.org/about/openupgrade

- https://github.com/OCA/OpenUpgrade

Hope it helps.

You can export and import blogs between Odoo v13 and v16, but the fields need to be mapped correctly since the blog model structure has slight changes.

In Odoo 13, you should export with the following fields:

name

blog_id/name

blog_id/subtitle

blog_id/cover_properties

content

tag_ids

In Odoo 16, you should import with these fields:

name

blog_id/name

subtitle

cover_properties

content

tag_ids

Make sure to include all available data during the export (images, cover properties, tags, etc.), because Odoo will only import what is mapped correctly to the new version’s fields.

This way, your blog titles, subtitles, content, and banners will appear properly in Odoo 16.