The Korean test is significantly more difficult, if for no other reason, it takes significantly more time than the SAT to complete. Also, the maximum question difficulty is said to be much harder.

I don't see why there won't be a test taking arms race with SAT tests, that happened in all of CJK countries - the test has to have a dynamic range, and it's going to be golden tickets for upper middle classes, so it's going to be heavily gamed, and so the difficulty must monotonically grow to match.

That you can take SAT tests multiple times as pointed out in sibling comment, that could change the dynamic but doesn't seem like a fundamental change, I think there is still the path for "the test" to become such.

You can take the SAT as many times as you want and only submit your best score, so the pressure isn't the same.

Or, like me, you can completely abscond from the test and still achieve