There should be no differences between the two, whether the Macintosh 512Ke
came from Apple in that configuration or if it was done as an upgrade. The
Apple upgrade was a ROM swap from 64K ROMs to 128K ROMs from the Macintosh
Plus, and the most significant change was support for the Apple 800K floppy
drive.
The only possible difference is that the upgrade didn't include the 800K
floppy drive, although this is unlikely because that was the main reason
for the upgrade. Every Macintosh 512Ke shipped from Apple had an 800K
floppy drive installed.