Sysprep will allow you to do that as well, as long as the basic HAL is the same. You can have different disk drivers, network adapters, and video boards, and ghost can work just fine, provided you set up sysprep properly, and the aforementioned HAL is the same.
I was actually able to set up a single ghost image for a client once who had Dell laptops and Compaq desktops, and everything worked perfectly!
Mark
I wasn't familiar with Aloha Bob but my application was more for servers. We've turned some massive application server upgrades to new hardware from a weeks long job to a single day.