No, Xasthurs right. Despite that they have similar mottling, Hartmanns aircraft has the proper 'squiggly line' Gruppe bar that along with being yellow denotes that the aircraft is of 9./JG52, while the default skin has a horizontal Gruppe bar that shows it of 6./JG52. Also, the default skin has standard Balkenkruez while the one you posted has the later-war toned down markings. The mottling patterns are similar and that threw me off. (along with being Yellow 1).
I am starting on a Hartmann Bf.109G14, however.