Only the EQ/pre-amp, although Dozin should confirm.
The pickups and pickup switching options are totally different than the AR500.
Sorry to hijack the thread, but since your asked, there were three versions of the AR500. The first version was closest to Weir's guitars and is very hard to find as they are quite rare. I just happen to have one for sale:http://www.ebay.com/itm/300905265398?ssPageName=STRK:MESELX:IT&_trksid=p3984.m1555.l2649
Special pricing for Rukind members...
Chris - nice axe!