It’s a good point of comparison, because it’s a much bigger deal. A 9% lower callback rate, concentrated in the most marginal candidates, won’t have as big an effect on your life as college acceptance.
That's an interesting claim - you gotta source for that?
Charles Murray's "Facing Reality". It includes many tables of statistics that may interest you.
Note that despite a lot of anger toward him, I've read several of his books, and he goes to great lengths to state that he doesn't believe we should discriminate against people based on their race. I highly recommend reading his books rather than listening to commentary about them.