Rena Sanka and Aona Kozue is the same person.
However, it is stated that “Aona Kozue” Debuted On April 7, 2016. At That Time, 28 Years Old (Madonna) = Born In 1987.
“Rena Sanka” Debuted On January 1, 2013. At That Time, 20 Years Old (Candy) = Born In 1992.
There Is An Age Difference Of 5 Years. It Is Unknown Which Is The Official Birth Date And Which Is The Current Name.