I used the ref 1 with the uber and I have previously used a TWag. There's really no comparison. The TWag was a very usable cable with good flexibility while the uber is a very stiff, very microphonic, delicate mess. I would call the uber unusable for portable use, although people seem to use it that way. Just my experience and opinion.
I'm not telling you what to buy!
But yes, dynamic driver is different, high-range armature is magnesium coated, cables different, housing is apparently different as well on the z5. We don't know about the tuning but it may be different, too.
I'm looking forward to these. I hope they adjust the sound of the xba-h3, balancing it and adding clarity. We'll see! They seem to get that the housing needed to become more streamlined. Hopefully the bass will be tighter as well.