I wouldn't think it's a big change just because other people told me so.
Simply put, the main change is the replacement of AK-630s with Kashtan + the radar for kashtan (that's what that second radar that looks like bandstand is for). Removal of 2nd AK-130 for a fixed hangar. I really don't think the change in the range of Sunburn is that significant since the changed flight path just makes it detectable at an earlier stage, making it even less of a threat against US carrier group. The shtil-1 upgrade is probably most significant and that's the one I'd like to see on the first 2 also. Other than that, there were supposedly better electronics and upgraded versions of the original sensors. So, the main improvement comes in air defence, but ASW and ASuW didn't improve that much. Fundamental problems remain with Sov, and they are not going away.
Ukraine is not the same as Israel. One relies on America for its survival and the other is just looking west to loose some Russian influence. Pakistan and China are pretty their main customers, they can't loose that.
Why did they build 115/116? Probably as an insurance policy for 052B/C, it was suppose to be ready before 052C, but due to the slowness of Dalian and the slowness of delivering rif, 116 is still not commissioned. And really 051C is pretty much a 70s USSR concept AAW. China needs to move in the direction of the 21st century style AAW like type 45/Horizon class.
my post on engine was in China naval power, not civilian shipbuilding, you read the wrong thread.