I can't speak to an NPS comparison, but I will say that I recently switched a set of GHS Super Steels off of my MTD and replaced them with GHS Balanced Nickels. Either the output is noticeably lower, or the top end is just not as present, the latter is obviously going to be the case. My typical rehearsal space amp settings had to be bumped up a good bit for comparable volume. Again, this might just be the presentation of top end fooling my ears into thinking the output is lower, but it sure feels lower. That's not a bad thing per se, given that volume knobs exist