The ideal weight for a satin angora is 8 pounds. The ideal weight for a rex is 8-9 pounds. Both breeds are a 4 class commercial body type. The standard for the satin angora states the flesh should be firm, and well filled with good width and depth. If you are purchasing a satin angora for your experiment and full grown it is skinny and 5 pounds, you should find another breeder. For body types, both breeds should be very close to the same.