Hi there, with the Site Redirect upgrade, individual pages and posts should automatically redirect fine from your .com site to your .org site as long as the permalink structure is the same on both sites and your slugs and post dates stay the same as well.
There seems to be a domain redirect solution, but it just returns 404 errors for the other post pages.
If you show me a specific example of this I'd be glad to have a look. Could you provide links to the post on both sites?