The taxonomy of goral has never been consistent. Though four species were considered earlier, a publication by Petr Hrabina in 2015 recognized six different species based on external morphology. According to him, the species we find in Bhutan is Nemorhaedus hodgsoni Pocock, 1908 although they were widely identified as Nemorhaedus goral (Hardwicke, 1825) in the past. He also named the Nemorhaedus hodgsoni Pocock as Himalayan Brown Goral while the Nemorhaedus goral (Hardwicke, 1825) is the Himalayan Grey Goral. 

Link to his publication.