"The 149 is the military variant of the 139!"
That is actually not true. The military version of the AW139 is the AW139M.
For comparison, the AW139 has a certified MTOM of 6400/6800kg and carries up to 15 people in the rear cabin.
The AW149 lifts up to 8600kg (other sources say 8000/8100kg) and takes 18 people in the back.
The engines arent the same either. PT6 and CT7.