Source for "supplying C3 was problematic"...? There is no single word of "problematic supply" of C-3 in any of your sources. It is what you dream. There is mention of limited supplies of 601N supplies though.
Still not reading things properly, so a reminder:
22/1/41
A message on the C3 fuel situation (not DB 601N supply) has been sent by the senior engineer that proposes to re-install DB 601A engines in the Bf 110...
2/6/41: C3 fuel situation: Aircraft manufacturers have begun converting Bf 110s from the N to the A engines.
If you want to continue to believe that those extracts are all about the DB 601N supply situation, that's your pigeon - fact is there were problems experienced with C3 fuel supply.
Staying with the original question, in 1943 had the Luftwaffe been trying to use allied aero engines, as well as aircraft not all of them could have been operated to their optimum on B4 fuel.
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