Just resurrecting this old thread, as despite a search I'm still struggling to get definitive confirmation about versions of 'She Blows Hot & Cold'.
As far as I'm aware there are FOUR released versions:
1) 'Genuine' Single B-Side Version (approx 3.39 in length), from the 'Made In Heaven' 7" and Pic Disc (& on the 'Messenger of the Gods' singles set). This does NOT feature Brian on guitar. This features some studio chatter at the start and then a drumstick count in before Freddie comes in on vocals. It has a faded ending.
2) B Side Extended Version (approx. 5:51) from the 'Made In Heaven' 12" & Freddie Solo Collection: This does NOT feature Brian, and is an alternative and extended mix of the 7" version.
3) Alternative Version (approx 4.37) exclusive to the Freddie Solo Collection. This DOES feature Brian. This features NO studio chatter at the start, but still has the count in, and ends abruptly in the middle of a guitar solo.
4) Purported Single B-Side Version from the Freddie Solo Collection (approx. 3:27). Whilst this states it is the "B Side" version, it actually differs slightly because it has both the studio chatter & the count in at the start edited off (for what reason, God only knows) and comes in immediately with Freddie, and so is a unique standalone version. Other than this, it is the same as the 'genuine' B side original release, and does NOT feature Brian.
If anyone can provide confirmation of (or put me right on) the above I'd be very grateful.