CycloneIII and CycloneIV pin to pin compatible?

I reviewed the pin C3 and C4 assignments for E144 package and must confess, that my first statement was too hasty. The two devices are actually almost compatible, JTAG, configuration pins and power supply seem to have mostly identical pin positions. Some pins are incompatible, buts thats basically the same with migration devices within a family.

But I have to compile an Excel table for an exact comparison.

P.S.: I found that only two pins (4 and 22) are showing differences. All other have identical assignments, also including optional functions. I however didn't check DQS group assignments.

I also checked compatibility of some F484 package devices. I found exact pin compatibility of EP3C16 with EP4CE15 and EP3C40 with EP4CE30 and EP4CE40. I have a design with EP3C16 and EPC40 migration compatibility, so the three EP4 devices can be used as a replacement. Thank you for raising the question and kevin for the correction.