I'd say its about 20 - 25mm higher. I also run the lowest bars I can find (KTM SX Renthals). I guess I just prefer low bars. I got this to make me stand more when I had back problems last year, but it just feels like my arms are at an extreme angle and I have tricep issues, same thing with the Pastrana FMX bars I tried. When I get off my Hyper and sit on the GG it feels like a chopper with apes!
The key is in the mounting hole / center pivot dimmension. I got a feeling they are different though.
There is a pic in my gallery but its not a good view of the height.