Compare current workspace diff with remote

I'm in a particular case where I have to deploy sources from one repository (our deploy repo) to customer repository (release source to customer).

I saw that scm is caluclated where the scm is the one where files were committed and for which a build trigger occurred:

https://github.com/jenkinsci/last-changes-plugin/blob/master/src/main/java/com/github/jenkins/lastchanges/LastChangesPublisher.java#L155

In my pipeline I do a second scm checkout and I would like to diff in a way like this:

`svn diff -r PREV:BASE | diff2html -i stdin -s side -F report.html`

Where BASE is workspace with incoming new changes for the customer repo.

Is it possible to point to a different repo to show diff?

Thanks,
Luigi

Start with src/main/java/com/github/jenkins/lastchanges/LastChangesPublisher.java around line 155 to understand how the current SCM is selected. Reproduce the pipeline's second SCM checkout and determine how a different repository could be selected for the comparison. Done means the plugin can generate a diff against that repository, with the behavior verified in an appropriate plugin test.

Written by the indexing model from the issue text.