A noob question to be sure, but I figure I'll ask, to be certain. In Only War, do Specialist Classes (Ogryn, Ratling, Storm Troopers, etc.) get all the same stuff as rank-and-file Guardsmen of the same regiment? One of the happiest things I found in Hammer of the Emperor was that the Kasrkin were included as a regimental option; Cadians have long been my overall favorite Guardsmen, and the Kasrkin are somewhere between the best and the cheesiest of them, so even more points for me. Thing is, I don't know if that means Kasrkin Ogryns and Ratlings get the nice carapace armor, since they are Kasrkin, or if they are exempt by being "outsider" specialists, even though the corebook says that most specialists acclimatize enough to the regiment they are attached to to pick up their ways.
So, would my Kasrkin Psyker get the nice carapace armor, or will he be standing there in a trenchcoat, and maybe flak armor? Also sort of expected some of the regiments to mention a few classes that they don't regularly use. While I don't assume that the Krieg Death Riders refuse to have psykers, and a psyker on a horse is a cool thought, to me, I don't imagine them having Ogryns or Storm Troopers on horses, sort of like how I don't usually imagine Catachan having Commissars.
So, do all the regiments use all the classes, RAW, and do Specialists get all the same gear, good or bad, that the R&F Guardsmen get, based on regiment?