w_g_u,
For a comparison in the rules on your question, take a look on the FAA.gov web site and read through Chapter 3 of the 7110.65 the section on Runway Separation, Chapter 5 which is Radar Separation.
Basically on a planned Go Around one of the following must occur, one of the aircraft must pass through the Runway intersection prior to the second aircraft crossing the runway thresshold, or the landing aircraft must be restricted to hold short of the other landing runway, or the aircraft going around must be on a restricted low approach at or above 500 AGL.
On a un-planned go around, the goal is not to trade paint.
Mike
NATCA A80