Cost total is incorrect after other party imports XER

I sent an XER to the engineer that is reviewing my schedules for a large cost-loaded project. When he imported the schedule, the cost total was off. He sent me a PDF of the schedule showing the total cost. I made of PDF of the schedule from my application showing the correct cost. There are two attachments showing the difference.

I'm using 8.2, and he is using 7.0. I exported the schedule as a 7.0. Could the fact that we're using different releases cause this problem? Or is it something else?

Thanks,

Rob