Liz, that's going to be really difficult. In a very general sense, Dorits has a smaller growth habit; ie., smaller leaves, more compact, and smaller blooms. There are, however, exceptions, so that is *not* engraved in stone, and Dtps. can very easily take on the larger characteristics of the Phal, or the more compact characteristics of the Doritis. Throw cloning into the mix which, in many cases, will *not* yield an exact duplicate, and the Genus of your plant gets completely thrown up for grabs.
Unless your is a primary hybrid which is well known and easily identifiable, without expensive DNA testing, there's just not going to be any way to tell for sure.