Luftwaffe unit OOBs shows that the F version was widely used, and in general such units had a mix of C/D/E/F variants up to early 1943 when the G arrived in large numbers. I do not have much idea about internal changes, except that the Bf 110F had a DB 601F engine, similar to the DB 601E of the Bf 109 F-4 but with different reduction ratio.
The book "German Aircraft Interiors vol.1" show the very same picture posted above, and the captios says it is a F version. Not sure if it is enough to model it though...
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