I think the IMS CC question format is very implementation specific. Most systems can only import from cartridges created on a similar system. It may be possible import a cartridge created by another Moodle, but not necessarily packages from other systems. As far as questions, I think the IMS specifies that the questions are stored in QTI format within the zip archive. However I think the QTI format has been removed from Moodle core so that may not work. You may be able to import the QTI file manually from the zip with an third party plugin like Canvas question format.
Quiz
importing .imscc files in a Quiz
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