The only difference between the 5.15 LTS commercial and LGPL source packages should be that the commercial license headers are used in the commercial source package. So, e.g.

• the amount of files & folders and the name of files & folders should be equal in the source packages.
• If possible, it would be good to verify the size of the source packages too.
• please verify also the content of the submodules source packages (instead of testing just the single source package)

Qt 5.15.3 commercial sources in the archive:

http://ci-files02-hki.intra.qt.io/packages/jenkins/archive/qt/5.15/5.15.3-final-released/latest/src/

Qt 5.15.3 LGPL sources in the archive:

http://ci-files02-hki.intra.qt.io/packages/jenkins/archive/qt/5.15/5.15.3-lgpl-src-package/src/

--> later 5.15.x LTS releases will have same kind of paths in the archive.

Note! this test case needs to be run only for the 5.15.x opensource releases.