Is a Maximum Rate turn the same as a Minimum Radius turn
Yes is the short answer, and it occurs when flown at Va pulling the max allowable "g". Fighter pilots are more than a little interested in this for obvious reasons, except they often refer to it as "corner speed" or Vc, that relating to the speeds position on the aircrafts V-n diagram. A look at may clarify
http://www.flightlab.net/pdf/8_Maneuvering.pdf