The first link is not goto - just tracking. The second one is Synscan goto. There are minor differences between the black EQ6 with Synscan and the white EQ6pro - mainly the dovetail on the pro now accepts vixen and losmandy type bars whereas the black eq6 only fitted vixen bars. There are aftermarket replacement dovetail options like this one:
http://admaccessories.com/DV_Series_Saddles.htm
I think the new eq6 pros also have a larger diameter counterweight bar and an extension bar.
The second and third links are the same mount.