There isn't any difference but it doesn't matter.
I've been using the Makita BO6040, their first dual action machine since pretty much the first day it came out back in 2002 or so. There are a couple of things I've found. Less is more when it comes to product - particularly with the really good ones like Jescar and Menzerna. I start in forced rotation mode, then without wiping the product off, make a pass over the top in random orbital mode. This makes the product come off the panel better and results in a slightly better finish, for me at least.
You can switch to random orbit while the machine off but still moving but you can't go from random to forced with the machine moving. In fact, though they don't mention this in the manual, it's a good idea when switching from random to forced rotation to turn the pad against the rotation gently until the gears engage, that keeps them from clashing together when you start the machine and increases the time between services significantly.
This would be my, "If I had to pick just one machine." machine. I'd miss my rotary but I could still be pretty effective.
RSW