I found following two papers from a researcher with exactly same abstract and figures are also same. Both two are high impact journals. How could be this possible?
This is considered to be verboten; whenever you come across such reports, reporting it to the concern journals is your responsibility as a fellow researcher.
It is obviously not ethical to do so. Over and above that either one or both papers can be retracted by the Editors, when found violating the ethical norms and indulging into plagiarism.