[jacksonsabey]

would 2 different torrents that contain a file with the same exact physical hash share the same torrent file hash?

if torrent A and B both contain the exact same file, but torrent A only has the first half available, and torrent B has the second half available, could I combine both torrents to download that file? this could help fix old dead torrents or at least make the file searchable elsewhere by it's sha256 for example

[caf]

As long as they also have the same piece size.

[infogulch]

Not necessarily. If you have a smart client it should be able to combine them at the file-level since individual files are hashed as a whole now, regardless of the block size within it.