Regarding the differences in cabinets, yours are a bit bigger, maybe a little more soundstage and maybe a little more bass? Size matters....
A bigger cabinet does not necessarily give a larger or superior soundstage, or more bass. The Super 3XRS has a fraction of the cabinet volume of the original Hoyt 1.5, yet when I compared them side by side, the Super 3XRS had at least as much bottom end, and as far as imaging goes, the Super 3XRS is unbeatable - huge, well focussed soundstage. The room acoustics and the way the speakers are set up can have a huge effect on all aspects of a speakers performance.
Concerning the 7" alnico driver, there only was one, regardless of how it was, or is labelled, and there are no plans for it's redesign, now or in the future.