See the above tutorial for an explanation of how to change the name of a drumkit. Then, change the name of your current original Ludwig kit to Ludwig 1.0 or Ludwig original, whatever you prefer. After that, go ahead and use the conventional import process to get the Ludwig 2.0 kit into the system. As you noted, it will not have 2.0 in its name. You could then follow the tutorial process to add the 2.0 to that kit, and change the old original name back to just Ludwig.
This is a limitation that BB Manager has, which keeps you from adding a second kit with the exact same name to your BB.