How To Built A Concrete Bathtub Would A Wall Built With Concrete Blocks Be As Strong As Poured Concrete?

Would a wall built with concrete blocks be as strong as poured concrete? - how to built a concrete bathtub

I need to build a bunker and asked if I put the walls constructed of concrete blocks and steel bars, then 2 inches in the middle is filled with concrete center would be a new reinforced concrete wall is poured.