Hi Joe,
The measured width of the cutting area is 1379.5mm wide. So, it looks like it would work for you.Obviously, you would have some waste on the sides, but, meh. The actual machine dimensions are about 5 feet by 6 feet wide.
My bummer here is that I get baltic plywood but it comes in 5 foot square chunks (1525mm x 1525mm). I still have to cut that down, but I think they recently started carrying 4x8' sheets, so I'll probably buy that in the near future.
No idea on the difference between the machines. They do sell fiber lasers and yag lasers too... so maybe that's the difference?
I would contact Merry Gu, or Patrick Ma. They are both good and helpful, they know their stuff, and get you answers when you need them.
Wade