The Mueller Report refers to the burden "beyond a reasonable doubt" 10 times, some about whether to charge Russian contacts as crimes. That's very important...
So when Mueller Report says they declined to charge X as a crime...
So when SCO concluded that it could not establish conspiracy with Russian govt, it seems likely its standard was generally proof "beyond a reasonable doubt."
But that's not the standard for political accountability or impeachment.
There is sufficient evidence in this report to find a criminal conspiracy.