If an RPD file contains only configuration data, why does Quartus generate differing RPD files for EPCQ and EPCQA devices? Shouldn't they be identical?

Hi Mark, you can use same .pof/.jic/.rpd/.jam/.jbc of EPCQ with EPCQ-A if you enable the 'Disable EPCS/EPCQ ID' check option. Refer the "1.2.3.2 Programming File Regeneration Guideline" for more details. Refer the Note & Table of "Table 3. Programming File Compatibility Guide" of AN822, https://www.intel.com/content/dam/www/programmable/us/en/pdfs/literature/an/an822.pdf Let me know if this has helped to resolve your issue. Regards, Vikas