Yes. If you let me know what the WISC (specify -IV or -V) index scores are, I can look them up. There are tables for statistical significance of the difference between index scores, and base rates of the magnitude of the difference. Generally, the rule of thumb for clinical significance is both statistical significance at at least the .05 level (I prefer .01), and also a base rate of less than 10%.
I have assumed that you are talking about index profiles, or the diversity/range of a group of index scores. If you are referring to the significance/rarity of individual index scores, that information is captured by the percentile.
