Sharepoint SitePage

Using Graph API .

I want to access a specific Sitepage , I need to know the Sitepageid, based on /pages it will return all Page id within the Site,

Is there a way to get the Sitepage id directtly based on the Sitepage name.aspx ?

I want to detect files changes on that Sitepage and  be able to downlaod the files from the sitepage ? How can we do that using Graph API

I know we can detect files changed at the drive level within a site. I am looking for Sitepage can we do the same ?what API can be used ?