Never had a problem with the rear. Front gets more combined angle taking steering into account.I had read reports that new half shafts had previously been introduced for S/X to address the ride height induced wear on the CV joints.
New half shaft part numbers on Raven are likely due to the new drive unit (mating flange/ spline/ and or length) and hub bearings (flange/ spine).
Also, weren't the rear shafts the ones taking the brunt of the wear?