The only issue I can think then it's that the cables are 20cm longer, so you will have to grip them somewhere so they don't disturb you, there's plenty of room bellow the printer.
Oh there's other problem that maybe someone with more knowhow can answer. The um2+ uses a 35W heater, um2go I think uses 25W. Worse case scenario you might need to swap the one you have to the um2+ hotend. I know that um2go uses a less powerfull powersupply, but I don't know the actual numbers.
Hi heater is the same as um2 difference why they put a lighter psu is no heated bed .mechanically all pieces except rods are exactly the same as an um2 ,even the board is the same with all connections only heated bed is off in firmware.