@malexander The part number is exactly the same, N25Q032A13EF440F. I do understand changing again would just introduce a whole new layer of potential issues. I do recommend making some changes to the reference manual, though, as it currently states:
I know now that "drop-in" applies to the footprint of the device package only, whereas I obviously took it to mean something different. Nowhere does it state that the different parts require source code or design changes on the part of the user. That would have been a helpful note to save the inexperienced (like me) much troubleshooting time.
Thanks also for the code snippet. I'll see if I can get that working when I have a chance. For the moment, we've simply replaced the flash ICs on enough modules to carry us for a while.