They are BASICALLY the same, but not really. The older game, ZZ Bird-"Zinc Zurito", had thinner metal blade (propellor) and a thinner white witness cup that just slipped under a couple of tabs at 180^ apart. These cups could easily be knocked off of the propellor, but the Helice targets I have seen are much different as far as getting the witness portion to separate. The propellors are some new age plastics and thicker, with a button-type tab to "click" on the thicker plastic witness cup. It took quite a bit of force (using my fingers) to push the witness cup from the propellor. I have never shot a helice target, while I had shot a few ZZ birds, but from what I hear, you need to use a pretty tightly choked gun to center your shot to make the separation and have the cup drop in the ring.
Good luck and good shooting,
Mike Hessong* (MH*)