The phrases “born digital content” and “native PDFs” are interchangeable, but refer to the same concept.
A native PDF is a PDF of a document that was “born digital” because the PDF was created from an electronic version of a document, rather than from print.
A scanned PDF, by contrast, is a PDF of a print document, such as when you scan in pages from a print journal and then save this file as a PDF. Please only submit native PDFs.