Absolutely Mickey! though Violent Naples is the better all round film, both are excellent though, all 3 films in the Comissario Betti series are top draw but watch them in order ( without giving much away!)
If you don't want to pay much the pop flix lael have loads of these 5 movies on 2 disc sets for around $5 or so, and around the same in pounds in the uk. The "Mafia kingpin" collection of there's has 5 Italian crime films on including Violent Naples! and another Merli/Lenzi classic "The Cynic,the rat and the fist", the prints of these movies aren't too bad but aren't quite as good as the Alpha digital releases of the movies, they are both in widescreen, also on there you get the Tomas Milian cop film "Cop in blue jeans" the first and best in the Nico Giraldi series of movies he did, good film but no classic, also stars Jack Palance, you also get Kirk Douglas movie "The Master Touch" and the Fernando Dileo crime epic "Mister scarface" aka Rulers of the city, the print of this on the set is mearly a 2nd gen VHS transfer but is watchable..worth getting if your on a budget.