Ummmm... pretty sure my Horseware and PE ones are the same size, with the PE ones coming out slightly larger... (mine's an IDxconn 15.3 to give you an idea of build)
Unless my memory deceives me, which is highly possible
I have mine in normal size but more compact 15HH is in a 6ft and gangly 16HH ish TB in a 6ft 3 and a 6ft 6, the latter is possibly on the big side for him.