That PCARS to RL video is quite poor. The angle doesn't quite match up and seeing the track sideways will always give you a bad judgement of width and corner angles.
From that, the only difference I can see is PCARS have taller kerbs at Curva Grande, middle of Ascari and Parabolica. Also, the entry to the 2nd Lesmo is a bit wider. Banking on 1st Lesmo looks fine to me, but this is probably one of those things that comes across better by actually driving the track.
iRacing and AC both laser scans and looks identical to the RL video above. PCARS is the odd one out so if you're saying PCARS is accurate, you're saying real life is wrong
IMO it's not a big difference and I'm not that fussed. But anyone saying PCARS is 100% correct is clearly wrong.