Actually, the size of the grip frames are about the same, however the trigger reach on the N frame is about 1/8 inch longer than the K, L, or X frames. The major difference is the "notch" the web of the hand fits into on the N frame is set a bit towards the rear. Basically, it's really a subtle difference in shape and not purely size. IMO it's not really significant, however I do have hands a bit on the larger end of average. For someone with small hands or short fingers that increase in trigger reach may be an issue.