Yeah, I suspect they didn't want to piss off the Critters by creating an entirely new deity, but also obviously couldn't use Sarenrae whole-cloth. I'd be curious once the book comes out whether there will be a 'used by permission' legal bit in the front of the book, insinuating WotC got permission from Paizo for adapting one of their gods for it. Or if they filed just enough stuff off of Sarenrae to act like she's "new enough" to not infringe. (I did notice Chris said she was now the goddess of "atonement", which is different not only from Sarenrae in Golarion (sun, healing, redemption), but also "Everlight" her equivalent deity in the Tal'Dorei Campaign Setting (compassion, redemption).
So they might have changed her portfolio a little bit as well as changing the name just enough. And truth be told, my using 'Rae' is just me assuming that's how they are spelling it... for all we know they made an even more different spelling just to differentiate the goddess further.