You'll need to use DPP 3.14.41 for the 7D files; 4.1 only works with the three current full frames and the 7DII (EDIT: also the 1D C). Since 3.14.41 processes somewhat differently from 4.1, to do a real apples-to-apples you'd probably want to use 3.14.41 for both, although it probably won't be optimal for the 7DII.
<sigh> Thanks. I'll go get it downloaded and installed tonight.
That's a pretty shoddy release of DPP if it only works with new cameras; it would be nice if they called that out somewhere CLEARLY when downloading/installing.