Is serial killer in Stockton, Calif. also Chicago's "Duck Walk Killer"?

Detectives in Stockton, Calif. and Chicago are teaming to see if the same man took two lives in Chicago in 2018 and at least six recently in the Stockton area, sources say.

source https://www.cbsnews.com/news/stockton-calif-serial-killer-chicago-duck-walk-killer-rogers-park/