Asynchronous writing, blogging, and collaborations can be seen as patchwriting if you use multiple sources in whatever subject you’re writing about. If you bring together these multiple sources without citing them then it can be seen as patchwork because you’re only taking small bits from each work. Plagiarism is dominantly pulled from using a single source without citation versus patchwriting which pulls from various sources without citation but reformatted to where it appears to be your own product. Also whenever plagiarizing one typically pulls more information out of a previously existing work while patchwriting uses less information but more sources to satisfy the length.
Blog Post 23: Collaboration and Patchwriting