It's most likely II./JG 26 which received the DB 601N-powered aircraft but I am still hesitant to see this type as more than a "candy bar" for the most successful pilots (still too much of a guess rather than knowledge). "White 4" (of Uffz. Perez) was the personal aircraft of Hptm. Karl Ebbinghausen (the commander of II./JG 26, hence the killmarks on said aircraft) before it was passed on to 4./JG 26. Having either the Bf 109 E-4/N or the Bf 109 F-0 tested by Stab/JG 51 in October 1940 would be interesting if the campaign engine allowed for such "rewards for outstanding performance".