Bf 109 against Bf 109?

[GuerraCivil]

I have read that Luftwaffe´s Bf 109 units had sometimes to face an enemy who also flew with Bf 109!

I wonder if anyone knows about this incidents (if they are true?) and if there are combat reports available:

1) German vs. Swiss Bf 109´s during the summer of 1940? This may have been caused by the German planes entering in Swiss airspace.

2) German vs. Yugoslav Bf 109 in April 1941. I remember to have read about combats, when Luftwaffe pilots encountered mixed formations of Yugoslav fighters, which included also Bf 109.

3) German vs. Romanian Bf 109´s in late summer/autumn 1944 - this may have happened when Romania switched sides.

It would be interesting to know the victory and loss records of both sides during these combats.