The only difference is the little cutout on the slide for the slide stop to go thru during assembly. You have to manipulate the slide to accomodate that new position.
At first I thought I was going to have to cut a new spot on each slide to allow for assembly but to my surprise it just popped together.
I have not shot either with live rounds but empty, dry fire and hand rack etc seems all good.
I basically wanted the newer camblock setup with DC only. I'm a DC only guy. Although I do have a P85 in my humble collection.