The 32-year-old Oborududu stated after the fight that she learned lessons from that Tokyo bout.
She said. "I wrestled her in the quarterfinals in Tokyo, but here, I knew it would be tougher.
"I had to keep myself from attacking too much. My coach told me to move before attacking. I can say it was easy."
Victory in Istanbul was Oborududu's first Ranking Series gold after two silver and a bronze-medal finish.
Oborududu was also gracious in victory stating that Zhumanazarov might not have been at her best in Istanbul.
She added, "She was a bit better in Tokyo than here because everyone prepares better for the Olympics.
"I needed to be careful to get gold. In Tokyo, I attacked to get two points and then one passivity to win, 3-2. That was difficult.
"I am so excited. Now I have African Championships in May and then the Commonwealth Games. I want to win a world medal in September."
Oborududu now has her sights set for the 2022 World Wrestling Championships scheduled to take place in Belgrade, Serbia in September.