How can I choose which google drive backup whatsapp uses? I have two phones with whatsapp.

I have a whatsapp backup on one google account, and one on another.

Is there any way to choose which google drive backup to use, without removing all but the one google account?
You can't

From WhatsApp FAQ 


  In order to successfully restore a Google Drive backup, you need to use the same phone number and Google account used to create the backup


(Emphasis added)