Cynical
The picture in on one for the LX rear is of a centre lock front 585 which if it was a rear would be the Y-3CO so I don't think its the same.
Kendal
Yes they do share the same parts. in the Shimano documents it lists the 555 and 570 LX as having the same part number as the 752 and 756 XT. Last time I managed to buy the whole hub for the same price as the freehub and got new skewer cones, seals and bearings thrown in. Shimano prices have gone up a lot and now it is a lot more to buy a complete hub than the freehub body unless you can find one (perhaps a non disc) reduced.
Merlin
Chain reaction
I'm not an expert on this so it would be nice if someone else could confirm whether what I am saying is right/wrong