OK, I'm confused to.
Firstly, the firmware version and Kobo Utilities plugin will have not affect on this. Or at least, the plugin won't have any affect when sending a book to the device. You can use it to change the metadata after the book has been processed by the device.
For the title and plugboard, if you are sending the same book to two identical devices from the same calibre installation and library, they should be the same on the device. For something else to be happening, you would need to be doing something in between. The "something" would usually be changing some preferences or sending the books in a different way.
I would like to see what is happening. For that, some calibre debug logs would be good. I can read through these and see what is happening when you send the book. So, could you run calibre in debug mode, send a book that has series info and then repeat for the other device. When you restart in debug mode, calibre will display a message about it. When you close calibre at the end, it will display the log. If you could do this for each device and post the logs, I might be able to see what it is.
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