Comparing Datasets for Changes

I'm migrating data to a new system in the near future which involves mapping existing data to the data fields in the new system.

I want to be able to compare the data migrated into the new system to that which was exported from the old and flag up any changes.

In theory the two datasets - one imported to the new system (exported from the old) and one exported from the new should be identical.

Is there any way to do this in IDEA?  The only kind of compare I can see wants to total a field whereas I want to look for differences amongst all fields.

Thanks.