Are the power draws from the A6, Krait and Cortex A15 presumed to be equal? Would it be possible to reduce performance in return for lower power at a constant

Are the power draws from the A6, Krait and Cortex A15 presumed to be equal? Would it be possible to reduce performance in return for lower power at a constant clock speed? If so, it seems that one cannot talk about IPC without also knowing the power draw.