The two DTSs are not equivalent.

DTS1 starts at dts1402a.xsd
DTS2 starts at dts1402b.xsd

Two label resources share the same arc. That arc represents two relationships.
In the next version one of the DTS, the one of the label resources has been changed.

The diff path is:

the IDs to locate the relationship that has been changed is work in progress. Actually the Diff Path is:

Alternative 1:

[EvChange] with IDs of ConceptA and ConceptA
  [EvRelationshipFrom] 
    [EvTarget] Relationship ID is pending
      [EvValue] Resource ID is pending

Alternative 2:

[EvChange] with IDs of ConceptA and ConceptA
  [EvRelationshipFrom] Relationship ID is pending
    [EvTarget] Resource ID is pending
      [EvValue]

What's best?

Next problem is. What happens if there is a change because of adding an attribute to one of the relationships in DTS2? (Two labelArcs are required in DTS2) But no changes in the label resources. What has to be documented?