Be careful using the zexp export/import. The imported objects will have new intids and this will break relations and possibly make it difficult to create new relations with them (for things like Related Items). See Maintaining zope intids on zexp imports. I don't even bother trying to use the zexp export/import anymore and think it should probably be dropped in modern Plone. It's almost always better to copy an entire database or serialize/deserialize in some other way.
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