RDNG : comparison/diff report between Changeset and stream
Accepted answer
The comparison schema and API (new in 7.0.2) are documented as part of the DOORS Next Reportable REST API - it's at the bottom of this page https://jazz.net/wiki/bin/view/Main/DNGReportableRestAPI
It looks very straightforward to invoke, you'll just need an authenticated session. Doesn't appear to be any special headers required, same as the rest of the Reportable REST API, so once you've built the diff URL you can try it in a logged-in browser tab :-)
The output is XML, if you need some other format you'll have implement that yourself.