The only difference between these mags is the size of the bottom pad. Are you still having problems with your Wilson? I stopped watching your thread on PS.com about a month ago (that is one long lived post
The 47D has redesigned feedlips to aid feeding of HP (or SWC, I can't remember) and the cutout on the top front of the mag is a bit different as well. I don't know what the latter is supposed to fix.
I haven't noticed any reliability difference in my new 47D's vs. my 16 year old 47's. However, to be on the safe side, I use new 47D's for carry and the older mags (two spring/follower replacements over the years) for practice.