Board Thread:Questions and Answers/@comment-33273295-20171006170128/@comment-32271305-20171126133330

Z-awakening doesn't affect the chances, only Dokkan awakening does. If a card has a 50% chance to raise the SA of another card, and you Z-awaken that card, the chance would remain 50%, it wouldn't go back to 5% or something like that.

In this case it's even better, because if you Z-awakened AGL Super Janemba and AGL Omega Shenron from SSR to UR, the chance would go from 50% to 100%.