Which are differences?
Does nobody know the differences among these two DVD-ROM?
Perhaps no one cares?
Basically a cost reduction, redesign, what differences are you looking for that aren't in the specs?
Are not there then differences of performances or in the technical characteristics?
Maybe they're crossflashable?I had 8163B which I gave to my brother. It's a year and a half old, still works fine.
What should crossflashing them give if it really would be possible?
I don't know. It was just wonderin'...