Yes. It is perfectly. As you noted, the appxupload format is documented as a zip file containing the .appx and .appxsym files, and the .appxsym file is a compressed file with public application characters. An application and its creation are described in Application Packages and Deployment.
Generating this yourself or creating it through VS will give almost the same results, avoiding differences in the contents of appxupload (most likely, these are different application options or processing).
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