[GreenKeys] different HAL ST-6;s?

[Eugene Hertz]

Hi there. I recently purchased an ST-6 on ebay (item# 5763536492) I haven't opened the box yet, but now I see another ST-6 on ebay (5768866651) and just by looking at the pictures of the rear panels, they look very different! 

can anyone tell from the photos what the differences are? The one on now *looks* like it has more boards internally and also many more connectors on the rear. The one I bought seems to have an AC outlet on the back, for autostart, perhaps?

Eugene