@scook, yes, you are correct, TFS means Team Foundation Server.
@Glenn Stanton, thank you for your suggestions. With the existing versioning there are just hundreds of files and after awhile it is hard to say what exactly you did in each one and how much it differs from the others.
There's an interesting discussion here: https://discourse.ardour.org/t/how-is-version-control-not-a-thing-in-daws/89124
Lets hope that there will be a motivation to write .wrk/.cwp comparer that works with TFS or some other VCS.