In Siegelman's case there was a witness and clear quid pro quo.
https://www.nytimes.com/2006/06/30/us/30verdict.html
Siegelman was open about the quid pro quo.
You'd need to be able to explain what law or series of laws he broke. Whatever rules apply to DeSantis would apply to other executives. It would have to be illegal to give donors projects or to use leftover Covid money for this kind of stuff.After the verdict, Mr. Siegelman said: "If I am really guilty of this, then every other person in public office had better look out. Because everybody is raising money and putting people on boards and in positions."