It seems that the source for the Hannig vs Smolnikov battle was the Russian author Valery Dymich, that some years issued a text linking Soviet successes with JG 54 losses, "Fun hunting in the Eastern Europe". Christer Bergström made a comment on it and posted it on his site, showing that many German losses described by Dymich were either misdated, or scores of german pilots lost were greatly increased. So I would say that according to this the source may be not very reliable.
On the other hand, both the text and its comment seem to have disappeared from the Internet. I was only able to find a Spanish translation of it (
http://www.rkka.es/Otros_articulos/2...1_arcitulo.htm).
Here is an automatic translation in English of the passage about 28 Sep 1942:
"There is no doubt about who knocked the German expert of the month before last. On 28 September, at least eight of the II Bf.109G. and III. / JG 54 escorting Junkers of KG 3 when they encountered four Soviet fighters (two Yak-1 of 402 º IAP and two P-40E of the 630 º IAP PVO) which in turn covered with a formation of Il-2 . The results were mixed: in an unusual exaggeration German airmen claimed Soviet fighters shoot down seven (three more than they really were!) With the expert Leutnant Hans-Joachim Heyer knocking down the P-40E Chebotaryov Nikolay and his partner making Heinrich Sterr same with the other Kittyhawk flown by Nikolay Dolenko (both German pilots had claimed two victories each, and both Soviet airmen jumped and landed safely.) But one of the pilots of Yak-1, Leitenant Starshiy Smolnikov, returned the courtesy forcing the expert Leutnant Horst Hannig (6./JG 54) to jump from his burning Bf.109G-2, while his ace with tovarish 16 wins Starshiy Leitenant Dmitryevich Lijobabin Ivan struck down the Ju.88A-4 of Leutnant Immo Riebeck (1./KG 3) - all the crew perished. Lijobabin in fact probably shot down by a second Junkers who never filed a formal complaint, as the Luftwaffe lost a second Ju.88 during that fight. This was the second time Hannig was shot down over Russian soil, the first was on 17 March 1942. Hannig would be credited with 90 victories on the Eastern Front, and perish on May 15, 1943 on France, serving in the JG 2 Richthofen, a British Spitfire fighter hands when his account amounted to 98 victories."
By the way, the fight where JG 54 pilots claimed seven victories (5 Lagg-3 and two Il-2) was between 1300 and 1315 hrs, three hours after Hannig victory (registered at 1005 hrs), but in the same area.