Magento 1.9 - Modify CMS pages that are available in one store and aren't available in another

Question

I'm looking for for a way to modify CMS pages that are available in one store and aren't available in another store. First problem is that I cannot filter cms pages the usual way:

$collection = Mage::getModel('cms/page')->getCollection()
   ->addStoreFilter($oneStore)
   ->addFilter('store', array('nin' => $anotherStore->getId()), 'public');

Collection matches pages available for all store views ignoring 'not in' filter.

Edit: Following code gets stores that have relation with $oneStore but still it doesn't check if they have relation with $anotherStore:

$collection = Mage::getModel('cms/page')->getCollection()
   ->addStoreFilter($oneStore, false);
$collection->load();

Answer 1

try just

$collection = Mage::getModel('cms/page')->getCollection()->addStoreFilter($oneStore);

without ->addFilter('store', array('nin' => $anotherStore->getId()), 'public');