AX2012 Merge data

Hi, I am trying to merge data from one ax 2012 application into another.

This involves the HCMWorkers table.

I have tried the standard Ax 2012 Data export / import. However when it imports i get an error with the "DirPartyTable" which says that the record already exists (This occurs even when update existing records is selected)

Now i need a plan B.  I am aware that HCMWorkers import exists in AIF (No read though)

So my question is, how is everyone else handling situations like this.

Should such situations even arise?