No, the foam is completely different between the two shoes. (I’ve had both.) I’m not saying this to be an annoying prig...the difference in foam is enormous...there’s really no comparing the shoes. They’re not the same shoe or even all that similar. The Reebok RunFast is closer to the VF4% than the ZoomFly is.
That's the highest praise I've ever seen a Reebok garner. Might have to check them out! Did you like them?