Actually, there's very little difference between a "Blues Harp" (Hohner trademark name) and a regular harmonica; I think they adjusted the reed plate on the Blues Harp model to provide a little more room for bending, but as a practical matter the Hohner Blues Harp is pretty much the same as the good old Marine Band model.

I'm not sure from Sebastian's post whether he bought a Hohner Blues Harp or some other diatonic harmonica that the salesperson told him to play in "blues harp" style (cross harp, in other words). But either way, he should be okay.