I can't help with claims over Yugoslavia but as far as Italy is concerned:
3 April 1944: see
http://www.ghostbombers.com/JG2/jg2frame.html
3 July 1944: F/O Moubray of 238 Squadron shot down a Bf 109 of JG 77; a Beaufighter of 600 squadron shot down two Ju 87s of NSG 9
6 August 1944: a Beaufighter of US 414th NFS shot down a Ju 88 of FAG 122
9 August 1944: a Beaufighter of 255 Squadron shot down a Ju 88 of FAG 122
More details of all but the first of those in:
Nick Beale, Ferdinando D’Amico and Gabriele Valentini,
Air War Italy 1944–45, the Axis Air Forces from the Liberation of Rome to the Surrender (Airlife Publishing Ltd., Shrewsbury, 1996) ISBN 1 85310 252 0
Nick Beale
Ghost Bombers, the Moonlight War of NSG 9: Luftwaffe Night Attack Operations from Anzio to the Alps (Classic Publications Ltd., Crowborough, 2001) ISBN 1 903223 15 6