Importing EPS Code Values from One Database into Another Database

I am scheduling one project in a client's P6 database (v 15.1) and would like to export my data (containing EPS activity codes) to an XER and import the data back into my database (v8.3.3).  When I import the XER into my database, the EPS codes do not import, but my client's global activity codes do import.  I noticed that the client's database does not have any project value in their Enterprise structure on the EPS activity codes.  My four projects are listed under 02-Appo in their Enterprise structure.  If I get them to move my EPS activity code definitions