Welcome back to the Wefugees Community.
I remember that I tried to answer one of your questions with a very similar content here before.
If this is your original birth certificate and you already varified it, I can not think of a reason why you should apply for a new copy of the document. I am not sure if I understand your question correctly though. Did you already consulted the "Einbürgerungsstelle" (naturalization office) to get a detailed advice, as I recommended before?
All the best,