The two DTSs are not equivalent.

DTS1 starts at dts1301a.xsd
DTS2 starts at dts1301b.xsd

The name of the extended link role has been changed in the next version.

The diff path is:

After defining the role-uri mapping the result is:
NO DIFF PATH!!

Both DTSs are equivalent
       

The two DTSs are not equivalent.

DTS1 starts at dts1301b.xsd
DTS2 starts at dts1301c.xsd

The unused roleRef element has been deleted.

The diff path is:

NO DIFF PATH!!!
Both DTSs are equivalent