My research concludes that the Branson is the same, except for a shorter chassis, front axle and 3P implement attachment points.
My conclusion was that the 5520 was smaller dimensionally but weighed about the same so the material went somewhere.. and IMHO it showed in the axles and undercarriage. I might well regret my choice long term but that was my thought process. I wouldn't dispute that the trim on T574 was nicer...