They're both gourmands (StH to a much lesser extent) with patchouli, as you said MFfan. I personally don't see much resemblance, although perhaps in "feel" they are slightly similar. They could maybe live on the same street, but I don't see them as related. Your classmate was probably just trying to make an educated guess.
Not to mention that the quality gap and blending difference between the two is enormous. I much prefer StH. I think you're on the ball and wouldn't worry about it.