It's not so much the connectors themselves as the hardware internal to the pcm as well as the software that runs everything is different.

The '4288 is a direct replacement for the '7747, provided they are both from the same engine size, 4.3,5.0,5.7... The '7747 may not be the best choice for performance applications, but for simplicity, it would be an easier swap than the 8625 since it's a direct swap, no pin swapping. I know this because I have done such a swap in a friends '92 with the '288. The 8625 will run the 4.3L, you will just have to do some pin swapping at the pcm connector. There are wiring diagrams available on this site, or if necessary I may be able to provide you with wiring diagrams for both pcms.

The BCC(broadcast code) is the calibration code name/designation.
the .bin is the actual calibration file
the. xdf is used by tunerpro to organize the .bin file for human viewing, modification, etc.
the .adx is solely for datastream interfacing, datalogging, etc.

These are all different from one pcm to the next, but are the same between different calibrations/.bins of the same pcm number, if that makes sense.
Just food for thought.

Buddrow