Few query on EMC SRDF PMAX4 and powermax 2000 micro code 5978

1) what was difference between these two array

2) is symcli 10.0, 10.1 and 10.2 support these two array

3) ia there any change in command between 10.0 and 10.2

4) what will be the PMAX4? Whixh mocrocode version they use and array model