Different content within Canvas can be organized and shared in different ways, either by using sections or groups within a Canvas site.
For instance, you could use sections to apply differentiated due dates for Section A and Section B, for a particular assignment or graded discussion. Groups also function in a similar manner in regards to group assignments.
For pages, unfortunately there isn't a way to enable/disable a page for a particular group/section of students within a course site. By design pages are intended to be visible to the entire site. In more niche cases, pages have been created within a group's isolated site and any specific content for that respective group can be posted there.