If we are importing stats table from higher version to lower version, then before importing in the database, we need to upgrade the stats table.
UPGRADE STATS TABLE:
SQL> EXECUTE DBMS_STATS.UPGRADE_STAT_TABLE('ABC','STAT_TEST');
PL/SQL procedure successfully completed.
Now do the import:
exec dbms_stats.import_table_stats(ownname=>'ABC', tabname=>'TEST', stattab=>'STAT_TEST', cascade=>true);
PL/SQL procedure successfully completed.