Kris, 59, who met Caitlyn for the first time in July after her much publicised transition, said she calls her "Jenner," reported People magazine.
"I say 'Jenner,' she said.
The matriarch said the transition period had been tough for the whole Kardshian-Jenner clan and she has realised that everyone handles things differently.
"We're all people. We all have different emotions."
The former couple married in 1991 and revealed their separation in 2013, but are finally working towards a friendship again.
Even though the duo have been a couple for longest time, according to Kris the former Olympian is a different person now.
"I just thought she would be a little bit different. Bruce had a distinct personality and, you know, had definite characteristics. And Caitlyn has some different ones, I feel," she said.