I was under the impression that alot of it has to do with the amount of estrogen associated with the steroid. The cutting steroids don't cause a rise in estrogen and even cause a decrease in estrogen causing that "dry" look and not letting estrogen promote fat gain (or the bulk associated with it). While also cutting gear is usually alot more androgenic instead of anabolic giving that "dense" look (like DHT -type steroids for example). Cutting roids are more used to keep muscle and harden up while dieting more than to actually lose fat. So for your second question the answer would be no for the most part. Please correct me if i'm wrong
I do have a question for someone more knowledgeable though. If someone was taking test with something like arimidex to completely get rid of most estrogen, could that be used for cutting? just for general knowledge