I and my friend have had one paper via a journal(link) and conference (link), so as i have seen we have some mistake in not adding the desired change on the journal version of that paper based of the below rule ( journal version need at least 30% change):
So, it is okay to develop a previously published conference paper into a full-length manuscript and publish it in a journal later on. This is an acceptable practice, provided you clearly disclose the conference paper and include at least 30% new material in the journal paper
So, if possible i want to find out some site for automatically check the Plagiarism percentage of academic papers.
Also, i don't want to use , So i like to find out some way to check Plagiarism for this paper without using the sci-hub.se for getting the PDF version of the two above papers .