No not the same.
To tell the truth I have one of the earlier ones for Gen 5...like one of the first 20 made.
When I talk to the owner I ask him if I can just order a Gen 4. He said they were different just enough.
I had to wait about 2 weeks for him to get more parts in to build them.
I have a feeling a Gen 4 might work...just not as much cable slack.... id be surprised if there was more than 1.5 inchs difference.
Yah, length is about all I can think of. But even then, I wonder if it's a marketing trick to force people going from Gen4 to Gen5 to re-buy it again instead of just moving it over. Not sure how many people would actually bother with that but I know I would :)