Sure, just use Attribute Manager in the new file. Options > Element Attributes > Attribute Manager (or something close to that)
On the right side near the bottom you'll see an Open button. Open the old file. Select any or all of the old composites listed on the right (after selecting the Composites tab), and Overwrite or Append them into the current file. Use Overwrite if it is essential that the composites appear at the same index number as in the old file. Use Append otherwise.
Cheers,
Karl
