I didn't know there were such differences in a Gorf.
1) 2 speakers vs. 1 speaker (or at least the grilles, perhaps there are two smaller 4" speakers behind the 6x9 grill on the one)
2) The louvered vs. non-louvered vent
3) The deep dark blue vs. a the light purple marquee and front waist bezel (or is that all simply UV fade?)
4) Upside down back star sceen above the monitor.
This needs to be a sunday comic section "can you spot the differences" picture