I would reach out to the Bogner guru's but from what I can tell.
Factory differences:
The speakers. Standard: V30. Uber: V30 x 75.
The Grill Cloth. Standard: Tanish color w/ tan binding. Uber: Black w/ white binding
Back of the Cab. Standard: all you see is the input jack. Uber: Has Bogner square stamp.
I can not speak for all of these, thats why I recommend going to the Bogner section of the forum. Those guys will know alot more.
The older versions are different as well so you have to be careful. I think the older Uberkab's were Rear Loaded at 8 ohms instead of 16 and had 4 V30.
Not sure about the older Standards.
If someone were to change the grill cloth, speakers and back of the Cab, I have no idea how to tell the difference and that might require a call to Bogner to ask if there are any differences between the insides.
Good luck these are great cabs, I would be happy with any of them. Honestly most people will say the only difference between the two are the speaker config's.