All
If we disregard the WNr it is quite correct that Ivan Kozhedub claimed a Me 262 on Feb 19th. at least if we are to believe the Russians Valery Dymich and Viktor Kulikov who speculate that it may have been Uffz Kurt Lange from 1./KG(J) 54 who was shot down.
However (seems it always is) Smith/Creek state that Lange was lost on Feb 15th and of course claim that Feb 15th was the date of Kozhedub's Me 262 claim, but also make a note that "another edition of Kozhedub's autobiography gives the date of action as Feb 24."
Dan, in his Production log book, favours the dates Feb 15th and Feb19th as a back up....
Since Me 262s were lost on all three dates, I presume all I can say is that Kozhedub after all seems to have claimed a Me 262....

, but which one?....
Cheers
Stig