Hi MIke,
Yes, you can get the respective IDs from the reports you want by using the field 'ID'. The ID represents the Ad Schedule ID in the Campaign Ad Schedule Target Report and it represents the Platform ID in the Campaign Platform Target Report.
As a general rule, the ID field is the ID of the kind of report it is (e.g. the ID is campaign ID in the Campaign Performance Report).
Cheers,
Anthony
AdWords API Team