Ok so this is CARMELO REALE in
Il grande Racket, 1976:

...and in
Liberi armati pericolosi, again in 1976:

In both cases credited.
And this is ROBERTO REALE, in
I padroni della cittą, always in 1976:

...and again Roberto in
Avere vent'anni, 1978:

My big question is: were they twins? Or it was just one actor that sometimes used one name and some others another one? And sometimes had a wig, of course... I'm not sure, the frame from
Avere vent'anni makes me think that he's too thin to be the same actor...
What do you think?