The Bontrager claimed weight might be higher than the Truvativ, but I think Bontrager just did that to make the carbon Race X Light cranks appear lighter than the aluminum Race Lite cranks even though the reverse is true. There was a magazine test that reported that the Race Lite cranks weigh less than the Race X Light cranks. The Weight Weenies listings page confirms this.
The Race X Light cranks are also the same as the Truvativ Rouleur Carbon.
Also, I have both cranks. They really are the same.