Thanks Pierre and Samuli Kaski.
We got SAP confirmation as below.
Question1:
For EP java stack, you can only use the SAPinst (export/import) method
to do the system copy.
Question2:
The two path are both OK, they are both supported by SAP PAM.
For the path2 is more simple than Path1, and the possibility of
error occuring is lower. You can have a try the simpler path.
I am closing this message