Simply:
1. Export 10D items' files.
2. Search for the items you want to change.
3. Rename the 10d ones to the ones' names you want to change.
4. Import to the right place.
As I remember, I did like this, and I made a 7d nuker to be in 1d set.
EDIT: It was years ago, sorry if I missed seriously important parts, or I wrote something wrong! Use at your own risk, and always backup.