I think he would have been similar, domestically. However, Mussolini was also a expansionist who dreamed of becoming the man who restored the Roman Empire.
That kind of ambition led to him to unilaterally invade Ethiopia (gassing hundreds of thousands in the process), annex Albania and even invade Greece, all acts of unprovoked aggression that were made on his own initiative.
Well, in the end Mussolini may have been a blessing in disguise because the Italians were so incompetent, that the Germans had to bail them out in Greece.
The result being that Operation Barbarossa was delayed for a crucial six weeks, which meant the Germans would eventually get bogged down in the Russian winter.
The problem was Italy didn’t have the military power to restore the Roman Empire.
Mussolini should have been content with Libya but he bit off more than he could digest.