I finally figured it out. For one thing, the individual "part-0001" files don't show up when importing. They are there, and read. Just confused me.
For another - when I started the new, vanilla Calibre on the new system, before importing I specified an empty library, but the same library that I would eventually import into. But this put a new database in the empty library, and Calibre wouldn't import into it (because it wasn't empty).
I figured it out - by creating a different library before importing into the library I actually wanted. After the import was finished I deleted the original, empty library.
So in the end I got it to work.
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