Import
the Material Attributes
from
the original file
to
the new file via the Attribute Manager. In the new file, go to Attribute Manager, hit Open (on the right half of the dialog box), browse to the old file, and Open. Select the Material(s) from the list on the right half of the dialog and Append to the list on the left.
MacBook Pro Apple M2 Max, 96 GB of RAM
AC27 US (5003) on Mac OS Ventura 13.6.2
Started on AC4.0 in 91/92/93; full-time user since AC8.1 in 2004