No, not really similar.
In our play, the BCs facemask was grasped and pulled/twisted, and the ball was fumbled, all while the BC was still on his feet. I can’t say conclusively that the ball was, or was not, in possession when the helmet came completely off the BC’s head. But, the timing was very concurrent, and, as I said, the BC stayed on his feet, and immediately moved toward the loose ball in an attempt to recover it. He was able to fall on the ball and recover it. I don’t see this as being any different than a blocker who continues to pursue and block an opponent for several yards after his helmet has come off.
It will take me a while, but, hopefully, I will have time to look for that play and see if I can find it. Part of the problem is that we had games on back-to-back days, and I, honestly, don’t remember in which game this occurred. But, when I can, I will take a look.