To get hair to fit a different figure.

Change your camera to Pose or Aux view so you can turn the camera around without affecting your main camera settings.  Then just use your parameter dials: Scale,  XYZ Scale,  and XYZ Trans.   Turn the camera around as needed so you can check all angles.

Once you have the hair fitting the way you want it, go to "Object" in the tool bar at the top of the screen and "Change Parent" and reparent the hair to the figure's head.

At this point if you want, you can save the hair as a smart prop to your props library. That way when you load it again for that figure, it will automatically fit that figure IE: A3.

"It is good to see ourselves as others see us. Try as we may, we are never
able to know ourselves fully as we are, especially the evil side of us.
This we can do only if we are not angry with our critics but will take in good
heart whatever they might have to say." - Ghandi