apx 6000li

We have a cashe of APX 6000 Li's at work; about half have dual screens and about half have just the top screen. How do I tell the different models apart? Apparently, much of the documentation on the radios was lost. I am trying to recover as much as I can before I have to ask our radio...

I'm trying to find a solid detailed documented difference between the APX 6000 and the APX 6000Li's, as motorola doesn't seem to cover it and unfortunately our motorola rep is not even all that sure, and I was hoping someone on here might know. There was one other thread on here back in 2017...