we are no longer using VSC for backups, but as i recall you cannot see the "native" snapshots from the VSC plugin. You could also not see them under the "backups" tab in the vsphere web client. our VM admins wouldn;t normally have access to create or mount snaps outside of VSC.
The VSC snaps are just the same as any other snaps. The plugin makes it a lot easier for VM admins.