I am happy with this answer now. Another VFR pilot who was cleared on
the Cortez 1 transition route a month ago asked if he was cleared to
enter Class B (as I probably would have). He was chided by the
controller that he had already been cleared for the Cortez 1 arrival.

Thus I am confident that approval by ATC to fly the Cortez 1
transition route also carries with it approval to enter Class B
airspace.

Ron Lee