Pinout compatibility across EP3Cxx devices

Thanks very much for the quick reply, I really appreciate it. Unfortunately, I don't have access to the Quartus system right at the moment (someone else is doing the detailed design, and he's not available today), is there something in the literature that might list them, or anything similar? I've got a pinlist file from the 3C40 design...just wanting to see how many of those I/O pins that we've used might need to be reassigned (to pins which are common to all the devices), layout is approaching very fast. Hopefully just changing them will do it? I now wonder, though, if the bigger devices have fewer I/O pins available, those pins must have been used for something; will they need to be connected (e.g., power/gnd or something) for the bigger device? Presumably that won't make the smaller device unusable? What else am I missing? Sorry to be such a newbie on this...