Sorry, don't have the source though I believe it was a historical magazine. As I recall it was one of those 'blink your eye' moments told from the pilots view of diving on a Panther, watching first a puff from the main gun then a hit and engine problems. Could have been a 20mm from an unseen Whirble, no telling though he thought it was the Panther. As for it happening in other cases, I wouldn't be surprised for the odd Panther v Il-2 kill in the vast Steppes of the Soviet Union. I've never read of it but willing to believe with thousands of birds and tanks and likely many more shots a few landed.
Sorry, memory and speculation.
Boo