Why are theyre GUID ids. What is the difference??
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The format of the IDs is {hostname},{spsite-id},{spweb-id}.
Indeed. Here is an official note about it (See "Note for existing SharePoint developers"):
https://docs.microsoft.com/en-us/graph/api/resources/sharepoint?view=graph-rest-1.0
Site Id object explained here: https://docs.microsoft.com/en-us/graph/api/resources/site?view=graph-rest-beta#id-property
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The format of the IDs is {hostname},{spsite-id},{spweb-id}.