With all due respect, that’s simply not the case. The qualitative difference is discernable to anyone who immerses themselves in the מי הדעת הטהור of the Rebbe’s Torah. And I don’t mean skimming a sicha here or there. I mean learning l’iyun for and extended period of time. The more you invest in it, the more you will find. I’ve seen it happen many times to non-Chabad Yidden, whether frum or not.
הוי כל צמא, לכו למים