Restore whatsapp messages from one number to another Current whatsapp is linked to a non-existent number.
I want to create a new whatsapp account for my new existing number
I do not want to migrate my old whatsapp account to the new number.
If I were to move the crypto backup files of the current whatsapp, will I be able to restore it on the new account? 


Note - 
Non existent whatsapp number is currently installed on a Moto G2, un-rooted, stock.
New number is on a Nexus 5X, rooted.



Whatsapp FAQ page states the following:


  Restoring or transferring a backup
  
  WhatsApp will ask you to restore your chats and media from a backup
  when you verify your number. Simply tap "Restore" when prompted to do
  so. If WhatsApp does not detect a backup, it could be that:
  
  
  You are not logged into the same Google account.  2. You are not using the same phone number that was used to create the
  backup.
  Your SD card and/or chat history is corrupted.
  A backup file does not exist on the Google Drive account or locally
  on the phone.
  


The FAQ tends to imply that it might not be possible. I'm not sure if a google drive might do the needful. Has anyone had a swing with this?

Also, rooting the G2 might not be helpful as I'll need to unlock the bootloader first - which will wipe out the internal memory anyway!
As WhatsApp by default does not allow to transfer from a phone number to another, there's no way without root. Root would allow you to copy the encryption key and the conversation files located at /data/data/com.whatsapp folder to the target device.