Current is limited by the resistance of the cable. So a higher-amp brick will only work when a too-low brick for the camera is being used. It won’t compensate for a longer cable run otherwise, because the extra resistance of the longer run won’t allow it.
Now a higher voltage brick will help compensate for a longer run, but read that Long-Run USB Power Cords link for many solutions to longer runs. Members really came thru with some great solutions there. 