Hi,
you can use Oracle (export datapump "expdp/impdp") by moving (sde schema + all other related geodatabase sachemas) to the other instance.
to help you more, what is the current permissions granted to the user you are using for import .....?
by the way you can use the traditional copy/paste to move a set of features from one instance to another through ArcCatalog but you will need to define a DBTUNE parameter with specific information about the geometry storage type, tablespace,....etc
hope this helps.
Regards,