Sorry, meant to comment on this yesterday, but busy at work + home broadband died. I have 2 old-spec ceramic & 6 new-spec alnico HD bridge pickups.
I posted my first impressions in my Feline NGD thread
hereThe old-spec HD has a lot of the same midrange push as the new one, but is brighter with a little less low end. You can tell there's a ceramic magnet in there, it has that "sharpness" about it.
Compared to the CS, it has more mids (much fuller/fatter), a little less top end, & less low end.
Power-wise, it's in the same ballpark as CS/HD - my initial perception was that it has a little less outright power than the new HD but I'm not entirely convinced about that now, depending on the settings, it can drive the amp just as hard as those pickups.
In general terms I'd say the old HD is somewhere between the new HD & CS, perhaps closer to the CS. It also reminds me a lot of the Duncan Distortion but with much more clarity - for me, that's a good thing as I LOVED the DD before I discovered BKP.
Hope this helps...