I get a problem is I want to get id of each type of user in group(owner, member, visitor) in the Community Portal site like this
Return id of each user in group

but when i return another site (still Community Portal type of site), return ids are different

Return different ids

I know that different types of SharePoint sites (team sites, communication sites, etc.) have different IDs. However, shouldn’t objects within the same site have the same ID? Any help understanding why this isn’t happening would be appreciated.