Start with the evidence
Identify why a new version exists and whether the content changed or only its presentation. Keep the original available and label the newer file with a clear version or revision note.
Work through the example
A readable PDF export replaces a poor image for convenience, but it is derived from the same source. Labelling it as a derivative avoids suggesting that the supplier issued a second receipt.
Make the next step clear
Record the relationship between versions and which one was reviewed. Avoid endless final-final filenames; use a small convention that makes the accepted version and its source obvious.
Keep the source context
A readable source and a clear label serve different purposes. Keep the original document intact while adding searchable context around it. Avoid treating filenames, OCR output or a cropped image as more authoritative than the actual source.