At least part of these claims were made in the battle described at the end of the following page:
http://surfcity.kund.dalnet.se/italy_cenni.htm
Italian losses in this battle were 1 Macchi of 4° Stormo and 3 Re2002 of 101° Gruppo.
As for the claim by Horbaczewski on 4 September 1943, I can find it in "Aces High" as a Bf 109 shot down in Cittanova area, but there is nothing about it in the Osprey book about 43 Sqn, that is usually complete AFAIK regarding air battles by this squadron.