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I think they're both calibre.
The first one is the EPUB3 standard (well actually it's 2 of the 3 lines calibre uses for series metadata in EPUB3. The missing line would be something like <meta refines="#id-2" property="group-position">4</meta>)
The second is EPUB2 which doesn't have an official standard, but it may as well be the calibre variety considering how many ebooks in the world will contain calibre series metadata.
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