Reusing drywall sheets
I would not try to reuse drywall especially on a ceiling. The strength is in the paper and it is torn and the gypsum is now broken so trying to reuse is not a good idea. A small piece sure but the texture on that will make reuse more of a problem than it will save so no it is not usually a good idea even for a home job where you are doing the labor and not paying extra for that time. In truth I don’t even save new pieces less than 1/2 sheet because they are just not worth packing to a new job.