They are slightly shorter in length to the old ones.
The first pin is green now. and has an arrow on it, incase it wasn't obvious what way to put in.
The undersides are quite diffrent now. They now can't be loaded in upside down.
But heres the biggie. The last pin is gone. meaning you can't do the belt extension mod easily.
I don't mind if you post this info on any other nerf forums.