What is the difference between a president of the Quorum of the Twelve Apostles and an acting president?

Acting presidents have led the Quorum of the Twelve Apostles for 23 of the past 30 years.

Uchtdorf called as acting president of Quorum of the Twelve Apostles after Holland's death

Dieter F. Uchtdorf was called as the Acting President of the Quorum of the Twelve Apostles after President Holland's death.PresidentJeffrey R. Holland died on ...