Can anyone tell me the real difference between the true Acer Truncatum and the hybrid Pacific Sunset? I know it is a Norway/Shantung cross but what about their root systems, differing sizes, breakage, nutritional needs and such?

I cannot seem to find the real thing here in Medford, Oregon only the Pacific Sunset. No wait, one place says they have the true Truncatum but until it leafs out I don't know how to tell if it truly is.