I suspect there's no easy answer!
I know we have to go through the whole process again and could lose on either FCO or academic case, but has anyone tried successfully to utilise the first IAP result as part of their second IAP case?
If anyone has tried, I doubt whether they would find out whether evidence of a previous FCO/qualification decision was of any help at a subsequent appeal.
I don't think it would ever be given as a specific reason for allowing a second appeal - and I can't see a second IAP ever revealing more than that they had "noted" the evidence.
help sway a particular panel, if introduced very diplomatically
On the other hand, I can imagine another panel might not take kindly to the implication that, because a previous IAP had arrived at a certain decision, they ought to do the same (when they are independent and entitled to take their own decisions).