Once the 60GB pro system came out there was a slight change to the Falcon chipset that involved the memory chips, then a few months later Jasper followed.
Falcon rev.1 = 65nm CPU, 80nm die shrunk GPU
Falcon rev.2 = 65nm CPU, 80nm die shrunk GPU, reduced # of memory chips by half and only appear on one side of motherboard now
Jasper = 65nm CPU/GPU and reduced memory chips just like the previous revision.
Also, as hopeless said, they have different power draws and this is listed on the back of your console. As for the audio you may try hooking up your headphones to your monitor if it has an audio port and changing audio output. Hope this helped