those files are stock and do not change.
there is not a definitive list of files that do not change, that would be a pretty big list.
most helper files do not change. for some extensions like eCart, an objet file will be created in the WA_eCart folder with the name of the eCart object.
Universal Email will create a mail setting file in the webassist/email folder for each instance that is added. and if the option to crate a file to manage the email is selected a template file will be created.
other extensions like pro maps do the same, but the core helper files do not change from instance to instance.
