KSD minimized a ton of her character flaws, erased her past baggage with amnesia. Some of which was good like removing Carol's memories of the rape baby. Others were bad, like removing things that led to legitimate character growth like overcoming alcoholism and her time with the X-Men.
A big thing with her character too was that she was a C-List hero and knew it. She had an entire run dedicated to her trying to become a better more popular hero. The KSD run kind of skipped over all of that and was just like here's Carol, she's popular, she's awesome, with none of the legwork and Carol goes along with it.
They did keep her being a military hardass, and Bendis tried to restore some of Carol's tendencies to lean too hard in that direction with CWII, but Civil War II was fucking terrible and poorly done.
I wouldn't say she's not the same character, but she's suffered from basically the same thing Johns did to Hal Jordan, sweeping all the bad things and development that didn't match what he wanted or what DC wanted under the rug and pretending they're not there.