It's funny, regardless of the photo recognition software I put Cullens pics (DAO, DA2 and DAI) through that said same man, the new Cullen just seemed really different. Then I saw the black and white gif and it dawned on me....the stubble is throwing my brain off.
Thank you Ladylavellan on Tumblr for posting this.

For me, it's the hair. I can easily see his original face model in there if I cover the hair, but still have trouble reconciling straight hair with Ser Noodles, so the whole of his new model still throw me off sometimes.
I'll eventually get used to it, but I'll always headcanon he spends fifty million years pomading his hair into submission every morning, only to have the wild noodles pop back as soon as he breaks a sweat, either from the helmet or from... certain leisurely activities with the Inquisitor. 