I conversed with GMPartsKing on ebay and this is there reply regarding PN# 23224747 for the ebony color:
"So I called GM and they said the only design change was a material change in 2014. They changed manufacturers and that is when the material change took place. I was told that there was no noted design change that took place. This is however the newest and latest part number for this vehicle.
Thanks again!"
This makes sense to me, a more pliable, less brittle material using the same mold should be fine if they got it right.
To protect mine, as I've done with all my cars since the 1980s, I use Dash Mats. Florida's sun is brutal on cars and it's cheap insurance. I remember now that Dash Mat had a backlog so I ordered one from RZ's Custom Covers and the fit and finish and quality are top notch. $38 delivered.