I don't believe there's a way to do that unfortunately. You would need to:
If you don't see the option to add it back to the Nest app without resetting it, you'll need to reset your lock to factory defaults and then set it up in the new "home" within the app. I don't own one personally but with other devices it can try and find devices already setup but not linked to the app. If that doesn't happen, you'll need to reset it and set it up again as I mentioned.