Panasonic uj-841, uj 846-b drivers

we have some dilemma between the uj-841 and the uj 846-b panasonic burners

I have read on panasonic site that most of the spec. are the same (one is tray and the other is slot)

The only thing is that it says that the uj 846-b have 2 mb buffer memory ,and it says nothing about the 841 buffer ,doe’s it not have at all?

Can somone help us please with this info?

Mh, that’s for what exactly?

You cannot crossflash them anyway.