Hello Victor
You should be fine SEO wise with the default settings (as they’re different domains), but you can also set the canonical URL of the Discourse topic to be the Wordpress post url.
Enable the Discourse site setting embed set canonical url
, then the WP post permalink will be the canonical url of the discourse topic (i.e. it will appear in the head
of the Discourse topic HTML as the cannonical link).
For more context on this see