The ACT & SAT Reading are two different beasts! Over the next few weeks we will explore how they match up!
#2: Questions about specific details in the passage on the SAT & ACT are fundamentally different: the SAT requires far more careful textual analysis. These types of questions on the ACT are much more obvious. The pinch on the ACT is that you have substantially less time.
The two Reading tests boil down to a question of difficulty (SAT) vs time pressure (ACT).