PROBABLY YES, BUT.......
The Z-Unlimited is designed for the Ultimaker Original and Ultimaker Original+. It should work on the UM2, even more easy since you don't have to unscrew the axis for the moving head. You can just click them.
BUT........ you have to make a [big!] hole in the side panel when you put the moving haed in its place. Also the exact place and position for the extruder motor is a small question mark.
If this all is not a problem then you are set to go.
SInce the campaign goes so well, i will try to see for myself how to fit the UM2. If it needs some adjustment, then my goal is to add that before production.