EPUB and PDF serve different reading modes
EPUB is reflowable: text adapts to the reader and screen. PDF uses fixed pages. Conversion is useful for printing or a stable reference copy, but it cannot preserve every interactive ebook feature.
What to review
Check chapter order, footnotes, special characters and any image-heavy sections. DRM-protected ebooks cannot be converted. If the PDF becomes large, use Compress PDF, and use Add Page Numbers when the printed copy needs stable references.