The difference in the .ps file is that "/seven" is missing from one of the embedded fonts. I suppose this is because the build date is 27th on the left build, 28th one the right build, and the digit 7 happens to not be used anywhere else in the .ps file in that font; i.e., it's just a side-effect of the mdate.sh issue.
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Note the source package ships upstream's source as a tar.gz file.
