I'm not sure that's a fair comparison since the Federal level of prosecutions in the US is absolutely dominated by immigration cases (~70%) and drug cases (~10%)[1], which tend to be pretty open and shut in terms of preponderance of evidence. I don't have enough data to tell if the remaining 20% are really convicted at the same high rate or not.
[1] https://trac.syr.edu/tracreports/crim/540/