Multiple projects for one app in Firebase: What to give as Android Package Name

I already have a Firebase project setup with a production environment. I am wanting to create a development environment for my firebase app. I see there's quite a bit of documentation about this. I need to obtain a google-services.json according to the docs. To obtain a google-services.json, I have to add an app inside of the second Firebase project. My specific question is what do I give as the Android Package Name once I'm in the secondary project (giving the same Android Package Name as my original project seems like it will just point to the same place)? And do I fill out the SHA1 key? Any help would be much appreciated!