You can get specific CMS page collection in Magento 2 by calling interface, Magento\Cms\Api\PageRepositoryInterface.
PageRepositoryInterface is used when you need to fetch a collection of CMS page or get specific CMS page data.
You need to instantiate PageRepositoryInterface in __construct() method of Class. If you want to Get All CMS pages Collection refer, Get All CMS Pages Collection Magento 2
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