Over Hungary, it is impossible to identify Voll's possible opponents for sure. As I told you in many cases, there were there were multiple claims in the same area (not like in his last claims case). Especially 2 July, 1944 is a very messy day.
As for the Me 210s, the cited Squadron Signal book is very short on operational history and contains significant errors. 5/1. lost 4 crashed and two emergency landed plane on 13 April, 1944, see it in this book in page 31 (Hungarian) and 127 (English):
http://forum.12oclockhigh.net/showthread.php?t=15154