I heard the newer PTs had more curve-breaker questions, but I don't know that for sure. My scores decreased when I skipped around from PT 50s to 60s to 70s. It probably depends on your skillset, though.
There is a comparative RC passage, so it is definitely recent. Also, the LR questions were worded like the 60s and 70s.
@"Burt Macklin FBI"
The -9 curve compensates for the degree of difficulty of the exam.
... very newest tests, the 60s and 70s since you really can only ... exam and am taking the 60s and 70s i have left and ... retaking a couple of the 70s because they are subtly different ...