Current taxonomy is moving to being no difference. Many taxonomists are changing the species in genus Doritis to be in the genus Phalaenopsis. In the past, Doritis hybrids with Phalaenopsis simply meant that Doritis pulcherrima was used as part of the breeding to get the hybrid. In general Doritis gave a more upright spike and more flowers as well as the bright pink color when the typical form was used. Any specific physical differences would depend on the amount of Doritis in the background of the hybrid.