Is there a difference between these lenses?

Both Sigma 70-200mm 2.8.

http://cgi.ebay.com/ws/eBayISAPI.dll...MakeTrack=true

http://cgi.ebay.com/ws/eBayISAPI.dll...515311786&rd=1

The first one is an older model, but how old I'm not sure, so I don't really know what the element differences are. I would go with the newer one if it were me.

Danielle