u/LavfromSerbia

I have a chat history from old phone which died and i sent it to repairs, so when i bought new phone logged in with the same number. Meanwhile my old phone came back. Now i have two chat histories from the same number which wont combine: neither can i transfer the chat from old phone nor from the new phone. i tried backing up on google drive from old phone and then logging in the new phone to same google drive, but it wouldn't sync, it just overwrites the previous database.
Is there any way to combine those two chat histories?