2 versions of chief?

Everyone keeps talking about the heavier CLYW Chief and the lighter CLYW Chief. Which run is which and what is the difference in weight.

1st run is lighter at 65.2g post runs were 66.3g I am pretty sure. I like the lighter one i think…

i have both and i am not sure which one i like better lol but the lighter ones will be harder to find, since the rest of the runs will be 66.3 or the heavier version. ( i think )