City can't be found "proven guilty" by a so-called panel set up by the PL. It is not a criminal court. We are facing allegations (not charges) made by the Premier League as part of their own auditing process. The allegations are that we have breached some internal PL rules and that's it. If that panel decides we should be sanctioned and produces some evidence of criminality then it is possible (but very unlikely) that the Serious Fraud Office would decide to carry out their own investigation.
The charges intrinsically allege a coordinated criminal enterprise within Manchester City. As said, if (and it’s a pretty damn big if) the PL could uphold everything they’ve alleged then City would deserve the book, the gavel, the wig and the bench to be thrown and there is no doubt that the media and public would pressure the SFO to take a look. It would be one of the most high profile international fraud cases in a long time.
Now of course, its a huge hypothetical but the whole point of the reply was questioning if Chelsea accepting breaching FFP would create a precedent for City, which it won’t as the charges on the table are in different worlds.