Is it possible to merge two databases for the same version of the geeklog?

One is for a dev. site which has upgraded any of plugins for geeklog.
The other is a db used for current production site, that has latest data for users, user-prefs, stories and more.
I plan to upgrade geeklog for the production site so that I will merge the upgraded db with the db that is already upgraded and installed any of necessary latest plugins.

Well anything is possible.. It really depends how different the databases are.

What is important is that that the user ids line up in both databases. Everything from topics, comments, security assignments, etc. is assigned to a user.

You also need to make sure topics and topic assignments are not missing for articles, staticpages, etc

If the dev site has just upgraded plugin tables and the production site just has new records for users and topics (no deletions) then you should be okay but you should really test it and see. If there are say a missing user record then any content that user may have will not be able to display and could have cascading effects elsewhere...

The other spot you would have to update as well would be the geeklog plugins table to make sure all the latest version info, etc is correct for each record.

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One of the Geeklog Core Developers.

Eventually, I upgraded the main site, and added it the dev's plugins folders, and activated it.
By the way, I found an issue so report it after testing.

Sounds good. You can report all bugs on Github: https://github.com/Geeklog-Core/geeklog/issues

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One of the Geeklog Core Developers.