This info was posted on the Vasiks Forum

Is it possible to swap the key from my newly purchased 6000hd to a 9900hd as I am not happy with the usability of the 6000hd compared to the 9900hd.

Reply by Vasiks Forum Admin:

I wouldn't go trying it. The keys are different in structure because the 6000 key has a wifi identifier in it. If you do try it, it can invalidate both keys.