Currently, when using code export, the generated files include a timestamp time you run the export.
I use Webflow as a templating tool. I export the files into my project, and use version control to work out which files changed, and therefore which parts of my code I needs to be updated based on the new design.
Because every file has an updated timestamp added within it, every file is marked as 'updated' in source control. The option to remove the timestamp before exporting from webflow would make it very easy to see which files did actually have design updates.