The big difference between Romans and Italians under Mussolini is that Romans were much less ethnonationalist, and would eventually accept the people who learnt their language as their own, even allowing them to become powerful politicians.

But indeed, there are fascists elements in Rome, and that's no coincidence - the Fasces from which fascism takes its name, a bundle of sticks around an ax, was a symbol of the authority of the Roman state.