JSON sidecars
Photos can have companion metadata files. They are useful evidence, not disposable noise, and should not be mistaken for a second photo.
Evidence guide · Google Photos Takeout
A Takeout is not always a folder of one original file per photo. JSON sidecars, edited copies, album paths, and split ZIP parts can make the export look duplicated or unexpectedly large before you have even opened it.
Independent RomeoApps software. It maps a customer-owned export locally, leaves the original files unchanged, and never uploads a photo library.

What changes the size
The size difference is a clue, not a diagnosis. Keep the source export intact while you identify what each path represents.
Photos can have companion metadata files. They are useful evidence, not disposable noise, and should not be mistaken for a second photo.
Edited representations and album paths can make the same underlying moment appear more than once. Compare content and provenance before choosing a policy.
Numbered parts must be checked for gaps, unreadable members, and conflicts before a reconstruction is written.
A safer reconstruction
The paid reconstructor turns a messy export into a decision record rather than silently choosing the last file it saw.
Search questions
Sidecars carry metadata associated with exported media. The correct relationship depends on the export paths and content; do not delete them merely because they are not images.
Yes, when the parts belong to a declared sequence and the gaps, conflicts, and write policy are reviewed first. A tool cannot infer that unrelated exports belong together.
Keep the original export immutable, compare exact bytes and provenance locally, and make a new output with an explicit decision record.
Use the bounded local workflow in Takeout Export Reconstructor; it is designed for ZIP/ZIP64, sidecar history, conflicts, and resumable output.
Scope boundary