wtf, you mean 90 vs. 100 brake width or something. If thats the case it depends on your skis width, because it is the exact same binding in each case, but 90 mm brake vs. 100 mm. brake. Otherwise I have no idea what you mean.
i'm really confused, they're both the same damn thing other than the width of the brake. neither one is older than the other, since they're both z12's and they were introduced this year.