Is it possible to merge WhatsApp chat histories on 2 Android devices (but 1 account)?
If so, how?
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Admission: This doesn't fully answer your question, but it may help others struggling like I was with chat-history transfer. I couldn't better place my tip elsewhere (like here) because I don't have the reputation yet to allow me to do so.
Today I finally (read, much hair pulled over last few days) moved from my old Samsung S4 to a Note Edge (Note 4) with the same phone number. The directions WhatsApp gives for transferring history is incomplete or out-of-date it seems. In my case the last crucial step was to RENAME the msgstore.db.crypt8 file to msgstore.db.crypt. Bingo! This time when installing and activating WhatsApp the missing "Restore" question came up, and all went fine. HTH
Credit: crucial tip discovered in another response here at Stack Exchange.
The most realistic approach I've found is this:
Although the approach looks promising, WhatCrypt 2.4 failed for me. (This is the most recent version for October 2019 - no updates since October 2016. It's still available via the Wayback machine.). I get "Different key file for this database". But maybe I'm simply doing something wrong.