There is no CBS News content on WINS or KYW, just as there wasn't on KFWB before that station was put in trust.
The old Group W stations did not automatically get access to CBS content when Westinghouse swallowed CBS. I'd have to dig back into my archives to find the exact date, but I recall that when I was working at WBZ during the transition, it took quite a while for us to add the CBS affiliation. Even after I left in 1997, the overnight TOH newscasts were ABC-I, and for a brief time there was actually the bizarre collision of an ID that proclaimed "WBZ Boston, a CBS Radio station" right into "From ABC News...."
The CBS News product comes with a big chunk of spot inventory attached, and if you're not running it within the TOH newscast, you have to give up your own local inventory to clear all those network spots...even if you're a CBS O&O. At WBZ, where we didn't clear anybody's TOH news except overnight, that eventually meant that the CNN and ABC-I affiliations went away and the station went CBS-only. My guess is that the local inventory at WINS (especially) and KYW is so valuable that CBS has no desire to give any of that revenue away, even to "itself" (which is further complicated by the reality that the CBS News Radio product, while produced by CBS News employees, is distributed by Dial Global.)