Same mold, but it came out alot different. The Z Buzzz's were flat, the X has a dome and is less overstable.
For me, the Z Buzzz requires alot of power to get a straight flight with no fade. That X Buzzz is alot easier.
I love them. Only two colors were done, red and green. The green are pretty rare (except in my basement! Thanks, Keith).
"I wasn't born with enough middle fingers."