Ok, from what I can understand from the topic created here:link
The Trident Reel-to-Reel audio that was uploaded is a work in progress copy that was around when they were initially working on a release for the Rainbow, at some stage. Therefore, it contains various overdubs and audio inserted from the other night.
However, new unseen footage was uploaded to YouTube by user; durchhaltenbis70, and (to my knowledge) appears to be un-edited audio from the first night. The official 2014 DVD seems to use both the first and second night's audio/video as Freddie can be seen not to sing 'In the right-a right-a away' on the unseen footage but on the official release, it's there. So my only conclusion is that the official release is using the first night's audio up until that point when it switches to either the second night's or a studio overdub.
Here is a best source merge containing the original trident reel and the presumably unedited audio. I, of course, could be 100% wrong here, but it's difficult to make any judgement considering there is no audience recording to base off of. link
* Soundboard - Trident reel tape - pre-FM cassette - cassette - CDR (1) - WAV - GoldWave fix
** Pro - ? - TV - ? - YouTube
0:00 - Son And Daughter *
3:51 - Guitar Solo *
8:29 - Son And Daughter (Reprise) *
10:32 - Stone Cold Crazy *
13:10 - Liar */**/*