Roughly. They're not the same test, obviously, but both indicate your rank order in the population in related skills. As much as the College Board claims you can directly equate all of their measures, I would be careful about doing so to that level of precision. 97th and 98th percentile aren't substantially different (despite one falling one side of the Mensa line, and the other falling on the other side). On the actual PSAT/NMSQT percentile chart from your 9th grade administration, you fall at the 95th %ile for 10th graders (
https://collegereadiness.collegeboard.org/pdf/psat-nmsqt-understanding-scores.pdf), which I cite mainly to point out that a point up or down here and there can appear to make a difference, but really isn't meaningful.
You have NMSQT scores from fall 2017, when you were actually a 10th grader, and thus the 10th grade national percentile charts from the PSAT/NMSQT would apply to you. That would be a better way of ordering you than extrapolating onto the PSAT 8/9 charts from your 9th grade PSAT/NMSQT score.
The bottom line, again, is that you are clearly bright and capable, and on an excellent track to be college-ready academically. Your life outcomes are highly unlikely to be affected principally by whether your "true" IQ falls to one side or the other of the nominal GT line, since ultimately, noncognitive factors (character, responsibility, work ethic, resilience to failure, compassion, social skills, etc.) will distinguish you more from other high achievers --GT-identified or otherwise-- than intellect alone.
A kind-hearted and trustworthy 128 IQ is far to be preferred over a self-centered, cruel --or even merely careless-- 148.
