I don't know if the TBS hack is able to save the master templates as well. But you need them to compare them.
This is how I do template upgrades:
- I save the original old master templates to text files
- I save the original new master templates to text files
- I use a file compare utility to compare the old and new template files
- I insert the changes I find into my modified templates
I never used the TBS hack so it is possible that it can save the master templates.
I use this script:
Save template to textfile