Just compare the grinder burr to the burnished burr under a microscope. The grinder burr looks like a ragged and fragile edge while the burnished burr looks more like a smooth knife edge.
I've used both and almost always take the few extra seconds to hone off the grinder burr and add a burnished burr. The times I used the grinder burr I used CBN wheels from 80 to 600. 600 worked the best for me but none lasted as long as the burnished burr. The two do have a bit different "feel" in use.
Also, don't remember if I mentioned this earlier but when a burnished burr starts to get dull, I generally refresh it at least once with the diamond hone and burnisher before returning for a pass on the 600 grit CBN wheel.
JKJ