What is the difference between Automatic memory management & Automatic shared memory management?

AMM: Automatic memory management  is introduced from 11g, we can specify the target size for the instance memory. The instance automatically tunes the target memory size, redistributing the memory as per the demand of SGA and the instance PGA.

ASMM:  Automatic Shared memory management is introduced from 10g, it is partially automated, in this mode we can set the target size for the SGA and then setting the aggregate target size for the PGA or managing PGA area individually.