Balancing of a wheel is the same, be it aftermarket or OEM....
Problem is, people don't take time to make sure the wheel is centred on the balancer and they don't set the balancer up properly for the wheel specs.....
Another thing I have struck is, they don't take any notice to the wheel, whilst it is spinning on the balancer for roundness.....They let the balancer spin the wheel, wack on the weights where it says, spin it again, and providing it comes up 0 0, she'll be apples...
Sometimes, a simple thing like spinning a tyre 90 degrees on a rim can improve the weight distribution required therefore reducing or eliminating the chances of a vibration....