It can be either PDF encapsulated as a Kindle file with Amazon DRM or it might be a fixed layout epub3 as KFX, or something else.
Note that PDFs can be image or text based or a mix. PDF is itself an envelope with layers for each page and instructions as to placement.
So the only things sure about Print Replica:
The layout and page count and numbering is identical to one paper edition.
If you screen is smaller than the paper page size, the quality will suffer. On smaller kindles and larger originals it's unusable.
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