Well I know all the HMann hairs (or at least those sold by Magix101) - have several of them myself - but generally they have a structure which is different from the one of this hair. Finer, more natural, sort of. At least that's how I perceive them.

But it could be interesting to know which one you were thinking of, then, if I have it, I could render them side by side to compare them. :)